Best natural monuments around Bourseville are primarily found within the Baie de Somme Picardie Maritime Regional Natural Park, a region known for its exceptional natural landscapes. This area features vast tidal flats, sandy expanses, salt marshes, and chalk cliffs where the River Somme meets the English Channel. The diverse ecosystems support a wide range of wildlife, including numerous bird species and seal colonies. It offers opportunities to explore unspoiled coastal charm and significant natural landmarks.
Last updated: June 21, 2026
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The cliffs are made of chalk and are impressive to look at.
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Here in Ault begin the chalk cliffs, which stretch all the way to Normandy and repeatedly appear as enormous cliffs.
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The cliffs around the beach of Ault are composed of chalk from the Upper Cretaceous, more precisely from the Turonian and Coniacian (around 83 million years ago to 90 million years ago). They are strewn with flint nodules which highlight the subhorizontal stratification planes (the formation of flint has already been discussed in Discovery of the geology of the cliffs of Étretat, presentation of an excursion from the beach of Tilleul (Antifer) to the Porte d'Amont (Étretat Nord)). The relative proportion of chalk and flint is around 90-95% chalk to 5-10% flint. Flint horizons are stratigraphic markers. On the cliffs of Ault, the regular flint band called Seven Sisters is recognizable and characterizes the boundary between the Middle Coniacian and the Upper Coniacian (around 87 million years ago). The boundary between the lower and middle Coniacian is marked by the Shoreham 2 marl level, which is more difficult to identify. These lithostratigraphic markings allow in particular the correlation of distant deposits, such as between the Normandy and Picardy coasts, or between the French and English coasts.
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A green setting in the heart of the cliffs, classified as a picturesque area since 1959. The Bois de Cise is an exceptional natural area, a small natural forest, originally wild and abandoned, which became a famous seaside resort during the Belle Époque under the leadership of a visionary who stopped at nothing. This coastal forest was originally a wild forest and a hunting ground in the Middle Ages. At the end of the 19th century, the Bois de Cise was sold off in lots on the initiative of a property developer and became a famous seaside resort of the Belle Époque. Today, it is a charming holiday and walking area that is best explored on foot via the narrow paths and wooden steps that crisscross the area. Very beautiful villas bear witness to the prosperous years before the First World War. Don't forget to go to the panorama, like Victor Hugo in his time, a fantastic viewpoint from which you can see the mouth of the Bay of Somme.
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The cliffs around the beach of Ault are composed of chalk from the Upper Cretaceous, more precisely from the Turonian and Coniacian (around 83 million years ago to 90 million years ago). They are strewn with flint nodules which highlight the subhorizontal stratification planes (the formation of flint has already been discussed in Discovery of the geology of the cliffs of Étretat, presentation of an excursion from the beach of Tilleul (Antifer) to the Porte d'Amont (Étretat Nord)). The relative proportion of chalk and flint is around 90-95% chalk to 5-10% flint. Flint horizons are stratigraphic markers. On the cliffs of Ault, the regular flint band called Seven Sisters is recognizable and characterizes the boundary between the Middle Coniacian and the Upper Coniacian (around 87 million years ago). The boundary between the lower and middle Coniacian is marked by the Shoreham 2 marl level, which is more difficult to identify. These lithostratigraphic markings allow in particular the correlation of distant deposits, such as between the Normandy and Picardy coasts, or between the French and English coasts.
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The natural monuments around Bourseville are primarily located within the Baie de Somme Picardie Maritime Regional Natural Park. You can expect to see vast tidal flats, sandy expanses, salt marshes (mollières), dunes, and impressive white chalk cliffs. The landscape is constantly shaped by the tides and light, offering a dynamic natural experience.
The region is renowned for its chalk cliffs. You can visit La Cise Cliff, which is composed of chalk from the Upper Cretaceous and features stunning white cliffs with flint nodules. Another impressive site is the Ault Chalk Cliffs, marking the edge of the Normandy Alabaster Coast, where the plain of the Bay of Somme meets dramatic cliffs stretching towards Le Havre.
The Baie de Somme is a paradise for wildlife enthusiasts. It's a leading ornithological site, with over 300 recorded bird species throughout the year, especially at places like Parc du Marquenterre. You can also observe France's largest colony of harbour seals, often seen resting on sandbanks at locations such as Pointe du Hourdel, particularly two hours before or after high tide.
Yes, Cape Hornu offers not only panoramic views of the bay and its wildlife but also has a rich history. Located near Saint-Valery-sur-Somme, its history is linked to the medieval town, including events like William the Conqueror's departure for England and Joan of Arc's imprisonment. You can follow the coastal path past the Chapelle des Marins, a small chapel dedicated to sailors.
For breathtaking views, Cape Hornu provides panoramic vistas of the Baie de Somme and its diverse wildlife. The Ault Chalk Cliffs also offer impressive views, with the vast plain of the Bay of Somme to the north and the cliffs extending west. The 'Route Blanche' between Cayeux-sur-Mer and Le Hourdel is another scenic coastal trail with spectacular views.
The area offers a variety of outdoor activities. You can enjoy scenic walks along the coast and through diverse ecosystems. For cycling, there are numerous routes, including gravel biking and road cycling options. You can find more details and routes in the Gravel biking around Bourseville and Road Cycling Routes around Bourseville guides.
Yes, the region is excellent for cycling. For gravel biking, you can explore routes like the 'Cliffs – Eastern end of Falaises d'Albâtre, Ault coastal panorama loop' from Ault. Road cyclists can enjoy routes such as the 'Cliffs of Ault – Ault Chalk Cliffs loop' from Woincourt. For more options, check the Gravel biking around Bourseville and Road Cycling Routes around Bourseville guides.
The Baie de Somme is a significant migratory corridor, making it excellent for birdwatching throughout the year. For observing the harbour seal colonies, the best time is typically two hours before or after high tide when they rest on the sandbanks at locations like Pointe du Hourdel. Spring and autumn are generally ideal for bird migration, while summer offers warmer weather for coastal exploration.
Many areas within the Baie de Somme Picardie Maritime Regional Natural Park are suitable for families. The diverse landscapes, including beaches and accessible paths, offer opportunities for walks and nature observation. While specific 'family_friendly' tags are limited in the provided data, the general nature of the bay with its wildlife and open spaces makes it enjoyable for all ages. Cape Hornu is listed as family-friendly and offers easy walks with great views.
Visitors particularly appreciate the dramatic coastal scenery, especially the impressive chalk cliffs like La Cise Cliff and the Ault Chalk Cliffs. The rich biodiversity, especially the birdlife and seal colonies in the Baie de Somme, is also a major draw. The tranquil atmosphere and opportunities for immersive experiences in nature, whether walking or cycling, are highly valued by the komoot community.
Yes, there are mountain biking trails available. For example, you can find routes like the 'Lighthouse far away from the beach – Hourdel Beach and Hourdel Point loop' from Woignarue, which is rated as easy. Other moderate trails are also available. You can explore more options in the MTB Trails around Bourseville guide.
The Hâble d'Ault is a unique lowland area isolated from the sea by a pebble bead. These pebbles originate from the slow erosion of the Pays de Caux cliffs. It's a wetland historically shaped for waterfowl hunters and is home to diverse bird species like mallards and shovelers. Its pebble areas also host rare pioneer habitats and plants adapted to the absence of soil, such as the nationally protected sea cabbage.


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