The cliffs at Ault are composed of Senonian chalk, dating back approximately 80 to 90 million years.
The Hable d'Ault, located adjacent to the beach, is a 50-hectare nature reserve formed by a shingle bar that enclosed a former bay.
The beach is part of a dynamic coastal system where the sea continuously carries away fallen chalk debris, preventing the buildup of large sandy stretches.
The site acts as a geological boundary between the steep cliffs to the south and the sand-heavy estuaries to the north.
The town of Ault is physically perched atop the cliffs, necessitating strict coastal management to mitigate erosion risk.
Plage d'Ault is characterized by its high, vertical white chalk cliffs that mark the beginning of the Alabaster Coast. The beach surface consists primarily of flint pebbles, which transition to sand at low tide. It is situated at the point where the Somme department borders the Seine-Maritime, separating the coastal cliffs from the low-lying marshes of the Hable d'Ault. The area is prone to significant coastal erosion, a process that has historically reshaped the cliff face. A seawall protects the town of Ault from the high-energy tides of the English Channel. The site serves as a vantage point for observing the diverse maritime bird species inhabiting the protected marshlands nearby. The beach is exposed to strong coastal winds, influencing local vegetation and maritime activity. Access to the shoreline is provided via concrete ramps descending from the cliff-top town level.
From the promenade walkway at the top of the cliff looking north towards the Hable d'Ault nature reserve.
Wear sturdy, closed-toe footwear as the flint pebbles are uneven and can be difficult to walk on in sandals.
Check the tide charts before visiting, as high tide reaches the base of the seawall and eliminates the walking area.
Bring windproof clothing even in summer, as the cliff-top location is highly exposed to channel gusts.
Do not attempt to walk along the base of the cliffs during an incoming tide, as the water reaches the seawall quickly.
Avoid climbing on the cliff base due to the persistent risk of rockfalls; adhere strictly to fenced-off hazardous zones.
