Durdle Door, Dorset

Durdle Door is a natural limestone arch on the Jurassic Coast in Dorset, England, and is one of the most photographed natural formations in the United Kingdom. The arch was formed by the sea eroding through a headland of hard Portland limestone at a point where the rock meets the softer Wealden beds behind — a process that began around 10,000 years ago as sea levels rose following the last ice age. The arch spans approximately 15 metres at its base and rises to about 20 metres at its highest point, providing an elegant natural frame through which the English Channel is visible from either the clifftop above or the pebble beach below. Two beaches flank the arch — Man O' War Beach to the east, sheltered by the enclosing cliff arms, and Durdle Door Beach to the west under the arch itself. Both beaches are accessible by a steep descent from the clifftop via paths from the Durdle Door car park, a 20-minute walk from the parking area. The car park is operated by the Lulworth Estate, which manages the surrounding farmland, and charges a daily fee. The clifftop viewpoint above the arch is reached without descending and provides the most widely published photograph angle looking down at the arch from above and to the east. The arch itself is structurally fragile — swimming through the arch is theoretically possible at the right tide and sea state but is actively discouraged by the Lulworth Estate due to safety risks from falling rock. Lulworth Cove, a circular bay explained by the same differential erosion process, is 1 mile east along the South West Coast Path and makes a natural complement to a Durdle Door visit.