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,[1] passing completely through Tintagel Island from Tintagel Haven on the east to West Cove on the west.[2] It is a sea cave formed by marine erosion along a thrust plane between slate and volcanic rocks.[1] The cave fills with water at high tide, but has a sandy floor and is explorable at low tide.[3]
^Wilson, Gilbert (1971). "The Influence of Rock Structures on Coastline and Cliff Development Around Tintagel, North Cornwall". In Steers, J. A. (ed.). Introduction to Coastline Development. Cambridge, MA: MIT Press. p. 152. ISBN0-262-19089-3.
^Tennyson, Alfred (1859). Idylls of the King(PDF). The Pennsylvania State University. pp. 12–13. Archived from the original(PDF) on 11 July 2012. Retrieved 19 February 2014.