The long undercliff walk from Black Rock to Saltdean was built between 1930 & 1935 as part of the sea defences to reduce the erosion of the chalk cliffs. The Gap is a natural break in the cliffs allowing access to the village.
Beach & Sea
The beach is backed by chalk cliffs and a life guard service operates in summer. There are rock pools to explore and the remains of tracks for Magnus Volk’s ‘Daddy Longlegs’ Railway can be seen.
History of coastland and marine habitats
Google Search for Rottingdean Beaches
British coastal highlights: The best beaches and seaside towns in Britain – Telegraph