Merlin's Cave is a cave located beneath Tintagel Castle, 5 kilometres south-west of Boscastle, Cornwall, England. It is 100 metres 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.Tennyson made Merlin's Cave famous in his Idylls of the King, describing waves bringing the infant Arthur to the shore and Merlin carrying him to safety.
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Address PL34 0, United Kingdom
Coordinates 50°40'3.403" N -4°45'36.728" E
