and blowholes

A boom, a roar, a spray of seawater, and sometimes a vertical jet of water up to 100 feet high. Blowholes, also known as gloops, are a thrilling discovery on a walk, where the roof of a sea-cave has collapsed and the incoming waves are powered up through the rock like a marine geyser. How well they blow depends on tide and weather, but top spots include the Devil’s Bellows and Devil’s Letterbox at Kynance Cove on Cornwall’s Lizard Peninsula, Churn Hole on the Farne Islands, all along the Pembrokeshire coast near Bosherston, and one at the end of Worms Head on the Gower Peninsula (pictured).

WALK HERE: Download Kynance, Bosherston and Worms Head routes at www.lfto.com/bonusroutes,