Geograph - photograph every grid square

Old Harry Rocks are sea stacks off Handfast Point (The Foreland), north of Swanage. They are formed of chalk and are classic features of coastal erosion. The rocks are under constant attack from the sea and Harry has already lost a "wife".

Sea Stacks are pillars of rock found on cliffed coastlines around the country. They are a result of marine erosion and wave attack. Many famous stacks are given names. When a stack has been eroded it becomes a stump, before finally disappearing.

Natural Arches are features of coastal erosion. They are found on cliffed coastlines and result from wave attack punching a hole through a headland. They are temporary features in the landscape, their roofs often collapse leaving stacks.