luxury houses for sale Royan, France

Boasting breathtaking 180° panoramic views over the Atlantic Ocean, this contemporary villa combines an exceptional seafront setting with a 280 m² (3,014 sq ft) garage accommodating up to 15 vehicles and an outstanding level of technical specification. A truly unique property on the Royan coastline. Set on a beautifully landscaped 1,278 m² (13,756 sq ft) plot, the property offers approximately 550 m² (5,920 sq ft) of total space, including 270 m² (2,906 sq ft) of living accommodation, arranged over three levels served by a private 7-person elevator. Designed to maximize the spectacular ocean views, the reception areas occupy the top floor. The spacious living room opens onto two expansive terraces, while the bespoke Bulthaup kitchen, fitted with premium Gaggenau appliances, blends seamlessly into this light-filled living space. The garden level features four en-suite bedrooms, including a generous principal suite, together with a home office and an artist's studio that could easily be converted into a summer kitchen. Outside, the heated double infinity pool sits within beautifully landscaped gardens. The villa benefits from exceptional technical specifications, including geothermal heating and cooling via four 100-metre boreholes, underfloor heating and cooling, double-flow ventilation, central vacuum system, solar water heating, water softener, electric shutters, alarm system and video intercom. A standout feature is the exceptional 280 m² (3,014 sq ft) garage, accommodating up to 12 vehiclesor 15 with a lift system. It is ideal for collectors, boating enthusiasts or anyone seeking a private showroom, workshop or extensive storage space. The lower ground floor also incorporates an authentic Second World War bunker, now converted into a climate-controlled wine cellar. Less than 90 minutes from Bordeaux and its international airport, this exceptional residence combines immediate beach access, spectacular ocean views, premium amenities and remarkable volumes in one of the most sought-after locations on France's Atlantic coast. A confidential coastal retreat where contemporary architecture, breathtaking ocean views and truly exceptional features create a one-of-a-kind property.

The advertiser did not provide an english description for this listing.

Royan Île d’Oléron Sotheby’s International Realty is delighted to present this unique property, enjoying exceptional 180-degree views over the Atlantic Ocean and a privileged setting sheltered from the prevailing winds. Nestled within peaceful, wooded surroundings, just a few minutes from the beaches and local amenities, this contemporary villa stands out for its generous proportions, abundant natural light and high-end finishes. The impressive 95 m² living area, enhanced by elegant Périgord stone flooring, comprises a lounge, dining area and bar. The entire space opens onto a south-facing terrace offering spectacular panoramic ocean views. The separate, fully equipped kitchen also features a cold room, combining elegance with functionality. The ground floor accommodates two suites, one of which enjoys magnificent ocean views, as well as a second lounge designed for rest and relaxation. Upstairs, five additional suites, each with its own private shower room, ensure outstanding comfort and privacy. An office, which could also be used as an artist’s studio, completes this level and benefits from breathtaking sea views. Exceptional for the area, the grounds extend over more than 2,600 m² and feature an expansive terrace. Part of the terrace is sheltered by an adjustable louvred roof, allowing the panoramic setting to be enjoyed throughout the seasons. An infinity pool overlooking the ocean completes this idyllic outdoor space. The basement includes a 58 m² games room, a laundry room and a climate-controlled wine cellar with capacity for up to 2,000 bottles. A double garage and several additional parking spaces complete the property. This remarkable waterfront villa offers an incomparable lifestyle, where luxury and tranquillity meet the endless ocean horizon. A rare opportunity for discerning buyers seeking an exceptional property on France’s Atlantic coast. Property listing prepared by Zohra Meysan – RSAC Saintes no. 447 558 313.

Royan – Île d’Oléron Sotheby’s International Realty presents Nestled behind a lush green setting and sheltered from view, this remarkable property is more than a house to be lived in — it is a home to be experienced. From the moment you arrive, an elegant entrance leads into a refined gallery that immediately sets the tone. Every space has been carefully designed to create a fluid and natural flow, as if the house itself guides those who discover it. The reception rooms, each with its own distinct atmosphere, are equally suited to elegant entertaining or more intimate moments of calm and conviviality. The dining room is dedicated to shared meals and lingering conversations, while the separate kitchen, discreet and functional, supports everyday living with ease and efficiency. Upstairs, the home reveals a more intimate character. The night area comprises six bedrooms, true peaceful retreats offering comfort and independence. On the top floor, a vast, light-filled office space stands out as an exceptional feature. Open, bright and inspiring, it can easily become a private lounge or a creative space, perfectly in keeping with the spirit of the house. Outside, the patio — a defining feature of the property — captures sunlight throughout the day and naturally extends the living areas into the garden, providing a secluded and serene setting. A workshop and a garage in the basement complete the property with discretion and practicality. This is not merely a residence of character. It is a home for living and passing on, an address where memories are made and every detail tells a story. Advertisement written by Zohra MeysanRSAC 447 558 313 – Registered with the Saintes Trade and Companies Register

The CHARTREUX IMMOBILIER agency presents to you a 1950s VILLA to renovate with an UNOBSTRUCTED SEA VIEW benefiting from an exceptional location FACING THE PIGEONNIER BEACH. With a living area of 197 m2, this 7-room main house is built on a closed plot of 899 m2 and includes: Entrance hall, living room and dining room opening onto a sea-facing balcony, kitchen with cupboard opening onto a terrace, hallway with cupboard, WC with hand basin, storage room. On the first floor: landing, bedroom opening onto a closed balcony facing the sea and a peripheral balcony, adjoining dressing room leading to a sea-facing balcony, bedroom opening onto a sea-facing balcony with en-suite shower room, WC and adjoining cupboard, shower room with WC, bedroom, hallway, bedroom with sea view and cupboard, adjoining dressing room, bedroom with SEA VIEW. Central heating with natural gas and electric radiators on the first floor. 2 GARAGES of 23.13 and 19.98 m2.This description has been automatically translated from French.

The advertiser did not provide an english description for this listing.

Only 30mn from Royan, 394m² character house offers 10 rooms, 5 bedrooms, 5 BA, SPA space on a closed plot of 930m² Exceptional location in a popular tourist area, close to the beautiful beaches of Saint Georges de Didonne and Meschers, only 20mn from Royan, just 1H15mn from Bordeaux with its International Airport and TGV station and 1H10mn from La Rochelle, in the very heart of a village with local shops: mini-market, hairdresser, bakery, restaurant, this “character house” offers 394m² living space faces South. The ground floor layout is arranged around the entrance hall and comprises 2 large reception rooms, a kitchen, a utility room and a cellar. Upstairs, the layout continues in a star pattern with 5 bedrooms, 3 bedrooms with en-suite shower rooms and separate toilets, and 1 bedroom with an en-suite shower room, dressing room, office and separate toilets. The outbuildings include a charming summer kitchen with a pizza oven, a SPA area: sauna and jacuzzi, a workroom and a woodshed. Added bonus, a further 29m² extension living space which could be converted into an apartment. All on a 930m² enclosed plot (suitable for a swimming pool) which welcomes terraces, green spaces, parking, vegetable garden The entire property is thoughtfully designed to create a warm, elegant and serene atmosphere place. Ideal for a family home or for develop-ing professional projects like “guest house”. Information on the risks to which this property is exposed is available on the Georisques website:

Exceptional 1000m² location, ideal for any business project Close to the Atlantic coast, not far from Saint Georges de Didonne and its renowned beaches, 2 minutes from local shops, 20 minutes from the A10 motorway Paris-Bordeaux, 20 minutes from Royan, 1H10mn from La Rochelle and 1H30mn from Bordeaux with its TGV station and international airport, this exceptional location of over 1000m² is situated in a strategic area with diverse and rapidly expanding economic fabric. This location presents a great investment and operating opportunity with excellent profitability prospects for all types of commercial, event-related, services or consulting activities. All this on a 1.7-hectare plot (17637m²) on a busy thoroughfare; maximum visibility for any business looking to raise its profile and gain exposure. (DPE D 206 GES B 6). Information on the risks to which this property is exposed is available on the Georisques website: www.georisques.gouv.fr. Excellent location for Professionals looking to secure their investment and develop a sustainable business

This large townhouse, designed in 1957 by Roger Mialet, features modern architecture and offers 256 m2 of living space spread over three floors, topped by a roof terrace overlooking Royan Bay, the town, and the estuary. Built on a 227 m2 plot, it is located 250 m from Foncillon Beach and the port.The architect has orchestrated a quest for lightness that is visible in the gradation of the structures: from the solid stilts at the base, the posts become thinner on the first floor, disappearing completely on the third level. The latter is crowned by a line of sunshades, the building's aesthetic signature. The ensemble is completed by the attic, added at a later date, offering a pavilion on the roof terrace--a space open to the outside and punctuated by the graphic rhythm of the V-shaped posts. The detail extends to the guardrails, which evolve from structural concrete to an elegant metal mesh frame, confirming the intention of lightness and finesse.Renovated in 2017 by the FMAU agency, this corner building offers exceptional modularity. The interior layout has been completely redesigned to form a complex and ingenious plan interlocking two dwellings and a gallery. The complex is designed to function as a large family home or as two completely independent apartments and a multipurpose space. Each apartment benefits from large terraces whose orientation preserves complete privacy.The interior design of the complex is intended to be as close as possible to the 1950s style, while preserving the original features that are still present. Particular attention has been paid to the colors, with the design of a wide range of subtle seaside shades, giving each room its own identity.Like a small private mansion, a beautiful main entrance lit by a glass block wall leads to the Comblanchien staircase that serves the upper reception and sleeping areas, with the lower level consisting of technical rooms, storage, and the garage. The bright blue color of the walls sets the tone from the outset. On the first level, a 55 m2 L-shaped gallery opens onto several balconies and is centered around a brick fireplace that stretches across a beautiful counter. A prominent pillar highlights the structure of the building. A new shade of blue adorns the walls, which end at the ceiling with rounded corners, while the floor has deliberately retained the marks of the redistribution: blond parquet and small tiles complemented by a covering reminiscent of terrazzo. The second part of the floor consists of a living area with a brightly colored open-plan kitchen, two bedrooms, a shower room, a veranda, and a large terrace. The two upper levels form a family duplex: five bedrooms, each decorated in a range of cheerful colors, complemented by two shower rooms and a bathroom with bright tiles. Some bedrooms have retained their original bathrooms, which are perfectly integrated into the many preserved features.Accessible by a spiral staircase that climbs skyward, the top floor is treated like the upper deck of an ocean liner with its laminates and curves. A living room with kitchen and a small lounge occupy a space where interior and exterior merge once again thanks to its surrounding rooftop overlooking the city: Notre Dame Church, Grande Conche beach, the port, the convention center, the estuary, and the ocean.A place that inspires the fantasy and joie de vivre of Royan's 1950s style, perfect for year-round living, vacationing, and open to new projects.

The advertiser did not provide an english description for this listing.

The advertiser did not provide an english description for this listing.

The advertiser did not provide an english description for this listing.

Royan Île d'Oléron Sotheby's International Realty is proud to present this exceptional Charentaise residence, built in 1830, where the timeless elegance of regional heritage blends seamlessly with contemporary living. Meticulously renovated to the highest standards, the property has retained all the authenticity and character that define historic country homes. Offering approximately 280 sqm of living space, it showcases generous volumes enhanced by carefully preserved original materials, including exposed stone walls that create a warm and refined atmosphere throughout. Designed for both family living and elegant entertaining, the reception rooms combine natural light, comfort and authenticity. The sleeping quarters comprise four bedrooms and a superb principal suite, providing privacy and exceptional comfort. Just minutes from the beaches, the vibrant market and the heart of Royan, this distinguished residence offers a rare lifestyle opportunity, where architectural heritage and modern refinement come together in perfect harmony. Listing written by Zohra Meysan – RSAC No. 447 558 313, Saintes.

Architecture from the 70s, this seaside villa of 181 m2 of living space in the regional style is oriented towards the ocean which it observes, on a wooded plot of 1,282 m2, on the second line on the beach of Nauzan.   Built in 1969, its architecture integrates many traditional regionalist codes in its design: entirely clad in dressed stones, two rectangular volumes are raised on two levels, the first rectangle houses five bedrooms and the second the vast living rooms. These two volumes are juxtaposed and slightly offset to create projections and recesses, on the facade and in height. The roof is thus composed of two asymmetrical lean-tos, one of which is raised, in order to form a vertical offset. The traditional volumetry of the house gains in dynamism. The sills and bands of the stone windows affirm the multiplication of openings. The main rooms open widely onto the terrace that runs along the entire southern facade towards the ocean, as well as onto the long balcony that runs along the western facade. Between the two, the corner has been hollowed out to create a terrace covered by the roof. The absence of an eaves is highlighted by the presence of two rows of sponge cake as a decorative motif. The arched and ironwork entrance door opens onto a vast double-height reception hall, surrounded by the timeless travertine staircase. The three bedrooms on the garden level share a bathroom. The upper level now has a large living room and a kitchen, extended by the terrace with a view of the ocean. Terracotta tiles warmly cover the floors. Two bright bedrooms and a bathroom complete the accommodation capacity. A renovation will make this house conducive to family life that will find its extensions outside, between terraces, a wooded garden and the beach.   A seventies setting to rethink.

With its contemporary architecture, this 195 m2 villa stands like a private belvedere amidst the pine trees, on a 667 m2 plot in the Parc de Vallières, overlooking the ocean, a stone's throw from the Grande Conche.     Designed in 2010 by architect Laurent Geoffroy, the project aimed to create a home fully immersed in nature: the house blends seamlessly with the existing vegetation, inviting the landscape into every living space. The architectural approach emphasizes verticality and transparency. Conceived on split levels, the interior circulation mimics an ascent towards the treetops, culminating in a spectacular panoramic view of the ocean. The garden level comprises two bedrooms sharing a bathroom and a spacious wellness area with a sauna and jacuzzi, opening onto the garden. A spectacular glass and steel staircase, a veritable spine of light, leads to a 41 sq m master suite on the first half-level. Its balcony-walkway, accessible through a sliding glass door, seems to float among the pine trees. The upper level, flooded with light by a ring of floor-to-ceiling windows, houses a 75 sq m living area. The open-plan kitchen and living room extend onto a large terrace that harmoniously integrates with the trees on the property. The sea view is ever-present. The minimalist interior design highlights the natural panoramas formed by the ocean and the forest. Polished concrete unifies all the floors, raw concrete is used on the interior and exterior pillars, and steel and glass offer striking perspectives, transparency, and mirrored effects. On the garden level, a multi-purpose room of 28 m2, a cellar and a garage complete the high-end amenities of this exceptional villa.     A contemporary seaside villa with spectacular architecture, yet whose integration into nature ensures refined discretion.

Architectural style from the 17th and 19th centuries, this Charente-style residence, located 25 minutes from the Royan beaches, is nestled in the heart of a wooded park of over 2 hectares, in the commune of St-André-de-Lidon.   Renovated, this former wine estate, restored in the 1980s, is now awaiting the project that will revive it, both as a family home and as an event accommodation facility thanks to its vast outbuildings. The main stone building houses the dwelling on nearly 350 m2. Surmounted by a cartouche recalling the history of the house, the double door opens onto the entrance hall, immediately illustrating the base: limestone floor layout and cabochons, doorways dressed with coffers, solid wood door moldings, flowered cast iron radiators, and porcelain handles. The curved steps of the elm staircase echo the curve of the wrought iron banister. The south-facing dining room features a simple fireplace with a staffed pediment. The large living room retains its herringbone oak parquet flooring and Crazannes stone fireplace. The generous kitchen with its terracotta floor features a unique corner cupboard resting on a stone stove and a raised cooking fireplace. A blond stone staircase leads to a vaulted cellar. The ground floor features a bright bedroom with a shower room. Accessible by two staircases, the upper floor includes a large landing and a mezzanine leading to four bedrooms, a dressing room, and a large bathroom. A games room with exposed timbers and a bull's-eye window completes this building. A second Charente house, currently converted into contemporary offices on approximately 300 m2, could constitute a second home with spectacular volumes, with its interior walkway with glass walls, its metal staircases, or its full-height workshop bays. The numerous arched openings let in light reflected by the travertine floor. Spanning over 700 m2, the outbuildings, consisting of workshops, garages, and wine cellars, some of which still have their barrels, allow for a variety of projects. Stretching all the way to the river, the park, with its varied tree species, holds surprises, such as an authentic Victorian greenhouse.   A family-sized property with exceptional potential.

Built in the 1950s, this 204 m2 seaside villa overlooks its landscaped plot of 1374 m2 , 250 m from Chay beach.     The villa was designed in 1953 by architects Anibali and Raisin, who employed architectural techniques uncommon in Royan at that time. Rectangular in shape, the house follows the contours of the plot, which includes a small dune. At the top of the dune, the raised ground floor is accessed via a gently sloping path that leads effortlessly to the few steps of the terrace. Opposite the house, an open-riser exterior staircase with a central stringer and its distinctive balustrade leads to the main entrance. This entrance opens onto a spectacular living room of over 40 square meters , flooded with light: the two exterior walls that form its length and width are glazed from top to bottom. An array of original wooden windows--fixed, tilt-and-turn, or French-style--provides access to a large corner terrace facing the ocean, which can be glimpsed in the distance. The details of the original construction are striking, such as the seamless integration of all the roller shutters into invisible housings or the recesses carved beneath the windows to accommodate the cast-iron radiators. The eye-catching brick fireplace features an original beveled shape. It is complemented by a mid-century modern bar unit, set at an angle and nestled within a backlit alcove. The travertine floor of the living room gives way to herringbone parquet flooring in the three bedrooms on this level. Each bedroom retains its large, fitted wardrobes with light wood fronts that match the doors of each room. The master bedroom, facing the ocean, is illuminated by a double corner window and has its own bathroom. The two other bedrooms, facing the pool, share a shower room and overlook the garden through elegant, generously sized sash windows. A stylish kitchen, with beautifully preserved custom Formica cabinetry, completes the layout of this level. It also opens generously onto the outdoors. Two French doors provide access, one to a rear terrace by the pool and the other to the main corner terrace at the front, perfect for dining or relaxing in the shade thanks to its ample concrete overhang. Connected by an internal staircase, the garden level increases the accommodation capacity with two bedrooms and a bathroom. A double garage separates these from a self-contained apartment comprising a living room opening onto the outside, a kitchen, and a bedroom with its own bathroom. The garden offers different atmospheres: at the rear, the swimming pool and its terrace are shielded from view by attractive deciduous trees, while at the front, older trees, including a majestic pine, provide shade and privacy. ARCHIK offers you its teams of architects to help you shape this unique property and adapt it to your needs.     A villa for lovers of modernism who will restore its former glory.

The CHARTREUX IMMOBILIER agency presents to you a BELLE EPOQUE VILLA located 300 m from the beach of Pontaillac. Nestled in the highly sought-after Pontaillac district, just 300 meters from the beach, this elegant CHARACTER VILLA from the 1920s showcases all the charm of a bygone era, with rare renovation potential in Royan. Built on a wooded corner plot of 608 m2, it offers 202.59 m2 of living space, along with several outbuildings: a double GARAGE of 30 m2, a complete basement, a boiler room, and a workshop of 20 m2. The garden level features a 60 m2 independent apartment, perfect for seasonal rental activities or for hosting family and friends. It consists of a living room, a kitchen, two bedrooms, a bathroom, and a WC. The ground floor revolves around a majestic entrance hall leading to an office, a kitchen, and a spacious bright living room that opens onto a raised terrace of 30 m2 facing southwest, with an unobstructed view of the garden. Upstairs, four bedrooms, three sinks, and a separate WC make up the sleeping area, while a converted attic offers two additional small summer bedrooms, accessible by a period wooden staircase. For any additional information and to schedule a visit, please contact the Chartreux Immobilier Agency, specialists in character properties on the Coastal Strip of the Royan area at 05 46 38 30 30 or by email: [email protected] description has been automatically translated from French.

Just a one-minute walk from Royan beach, with sea glimpses from the living areas, this 215 sqm architect-designed villa embodies a rare coastal lifestyle. Set in a highly sought-after residential area, it offers immediate access to the shoreline, between Royan and the main beach of Saint-Georges-de-Didonne. From the moment you step inside, the tone is set: elegant lines, generous volumes, and seamless flow. The main living space of approximately 50 sqm is filled with natural light and opens onto a patio and terrace, where a soft, serene atmosphere meets a hint of ocean views. A second split-level lounge, extended by a mezzanine, creates a warm and intimate space—ideal for entertaining or relaxing in privacy. The night area features four bedrooms, including a master suite with dressing room and en-suite bathroom, as well as a separate section with two bedrooms and a shower room. On the garden level, a fully independent apartment of over 50 sqm offers multiple possibilities: hosting family and friends, generating rental income, or creating a self-contained living space. A 38 sqm garage, utility room, cellar, and additional storage complete the property, set on a landscaped and enclosed 776 sqm plot. A cycle path directly in front of the house provides easy access to beaches and coastal walks, enhancing an effortless seaside lifestyle. A bright, elegant, and perfectly located property where every space invites you to fully embrace life by the ocean.

Just 10 km from the beaches of the Côte de Beauté, this noble 14th-century Logis set in almost 3.7 hectares of enclosed parklands offers 675 m² of living space and 1042 m² of usable space. This exceptional residence, enlarged in the 17th century, belonged to the King's squires and to wealthy Saulniers until the Revolution, when it was converted into an oyster farm. Pampered by History Lovers, the restoration of this characterful dwelling combines modernity with the preservation of its historic features, including frescoes, large fireplaces and a vast Renaissance staircase... The main Logis is complemented by three guest houses with separate entrances, providing a peaceful setting for entertaining friends and family and/or developing a professional activity. In the outbuildings of just over 500 m², a 175 m² semi-covered wellness area with a heated swimming pool extends outside with a 5-seater spa and Finnish sauna overlooking the forest. Two spacious, secluded and heated workshops invite artists' souls to blossom. A real Artist's studio with overhead lighting has been created in a former wine storehouse. A games room, garage and technical rooms complete the outbuildings. The outbuildings are equipped with solar thermal and photovoltaic panels, which significantly reduce energy costs while providing a source of income. Situated between Bordeaux and La Rochelle, close to Royan, this exceptional property boasts wooded grounds with fruit trees, a vegetable garden, a pond and a well, as well as a helipad in the meadow. As soon as you enter the driveway leading to the main courtyard, the peaceful soul of this Logis envelopes you in a warm, gentle way of life, making this a delightfully magical place. All three guest houses are sold furnished. It is also possible to purchase some of the Logis furniture. Maxwell-Baynes Christie's International Real Estate 27 Quai Valin 17000 La Rochelle France International Real Estate - Immobilier International La Rochelle - Ile de Ré - Royan - Ile d'Oléron CONTACT ‭+33 (0)6 62 49 61 23‬

Royan Île d'Oléron Sotheby's International Realty is delighted to present this elegant approximately 100 sq.m. villa, recently and meticulously renovated to combine timeless charm with refined contemporary comfort. Set on a 326 sq.m. landscaped plot, the property offers a private and peaceful setting. The beautifully designed garden features a heated swimming pool surrounded by spacious wooden terraces, creating an ideal environment for relaxation and outdoor entertaining. Its location is one of its greatest assets. Ideally positioned midway between the renowned Pontaillac and Le Chay beaches (approximately 1.5 km, or just a 6-minute bike ride), and only 800 metres from Royan's Central Market, the villa enjoys easy access to shops, restaurants and the seafront while benefiting from a sought-after residential environment. From the moment you enter, the property reveals a warm and inviting atmosphere. The light-filled living area centres around a lounge with a fireplace and opens onto a stylish, fully fitted and equipped contemporary kitchen, designed for both everyday comfort and entertaining. A beautifully appointed shower room and separate guest toilet complete the ground floor. Upstairs, the sleeping quarters comprise three attractive bedrooms showcasing magnificent original wooden flooring, including one with a private balcony. A dressing room and a second shower room with toilet complete this level. An attached garage further enhances the property's appeal. This turnkey villa is equally suited as a primary residence or as an elegant holiday home, just minutes from Royan's finest beaches, offering an exceptional lifestyle on the Atlantic coast. Listing written by Viviane Bonnefon EI – Commercial Agent – RSAC SAINTES No. 502 973 258

NOVELTY. 600 m from the city center and 700 m from the main beach. Charm and authenticity for this pretty 1930s house renovated with taste. It consists of a beautiful entrance, reception room, veranda lounge, equipped fitted kitchen opening onto the terrace, 4 bedrooms, bathroom, shower room, enclosed landscaped garden, swimming pool.

ROYAN LE PIGEONNIER. Superb location facing the sea. 1960s villa offering an entrance hall, living room, lounge, veranda with sea view, WC, and pantry. Upstairs: 5 bedrooms, 2 shower rooms, WC, and 2 dressing rooms. Pantry and garage on the garden level. Outbuildings. Enclosed plot of 1033 m2. Information on the risks to which this property is exposed is available on the Géorisques website: www.georisques.gouv.fr