description Cave Hole Overview
Cave Hole is a collapsed sea cave located at Portland Bill in Dorset, England. The geological feature consists of a roofless chamber where, during storm conditions, seawater is forced upward through the remaining structure, creating a dramatic blowhole effect. The formation developed in the Portland limestone, and the site is protected as a significant geological feature within the Jurassic Coast World Heritage Site.
help Cave Hole FAQ
Where is Cave Hole located on the Dorset coast?
Cave Hole is on the southeastern side of the Isle of Portland in Dorset, England, about half a mile northeast of Portland Bill. The chamber is roughly 50 feet square and 21 feet high.
Why does Cave Hole act like a blowhole during storms?
The roof of an underlying sea cave collapsed, leaving an opening above the chamber. During high tide and storms, waves compress air and seawater inside the cave, forcing spray upward through the opening.
What does Cave Hole show about coastal erosion?
It is considered an early stage of sea-cave collapse, formed in the Portland Stone coastline. Continued erosion can enlarge the roof opening and eventually turn the feature into a more open depression.
Is Cave Hole safe to enter during rough weather?
No, storm waves and high tides can flood the foreshore and force water through the cave. An iron grill has been installed over the roof opening, but the blowhole remains a dangerous coastal feature.
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