Durdle Door is a natural
limestone arch on the
Jurassic Coast near
Lulworth in
Dorset. It is privately owned by the Welds, a family who own 12,000 acres (50 km2) in Dorset in the name of the
Lulworth Estate. The name Durdle is derived from the Old English 'thirl' meaning bore or drill. The
arch has formed over many years and lies between Lulworth Cove to the East and Weymouth to the West.