A mile or so west of Lulworth Cove is another example of the power of the sea in eroding ancient rocks. The narrow band of limestone that once stretched along the whole coastline juts across a small bay, and a large hole has been cut through this outcrop to form a perfect example of a sea arch.
In calm weather it is possible to swim or canoe through the arch, or it can be admired from the shingle beach nearby, especially when the evening sun catches the Dor’s inner walls.
The name Durdle comes from Old English “thirl”, which means “to pierce”, and “pierced door” sounds like a perfect description.
(The photo has been taken from a copyright-free source)