Cave Hole is a large cave on the south east side of the Isle of Portland, a large peninsular in Dorset, England. It has a blowhole and a wooden crane, known as Broad Ope Crane on the cliff top. It is 1⁄2 mile (800 m) north-east of Portland Bill, has an interior measuring 50 feet (15 m) square and 21 feet (6.4 m) high.