Merlin's Cave is a cave located beneath Tintagel Castle, 5 kilometres (3.1 mi) south-west of Boscastle, Cornwall, England. It is 100 metres (330 ft) long, passing completely through Tintagel Island from Tintagel Haven on the east to West Cove on the west. It is a sea cave formed by marine erosion along a thrust plane between slate and volcanic rocks. The cave fills with water at high tide, but has a sandy floor and is explorable at low tide.
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- Media related to Merlin's Cave, Tintagel at Wikimedia Commons
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