Ault is on the English Channel, west of Abbeville. It has chalk cliffs and a beach of pebbles and sand at low tide. South of the town is a large wooded valley, the ‘Bois de Cise. North of the town the cliffs become smaller, to the level of the beach at Onival. The area around the town, the 'hâble d’Ault' was mostly tidal marshland. This has been reclaimed from the sea and is used for farming cattle and sheep.