Porth Hellick Down (also called The Great tomb on Porth Hellick Down) is located about 2.2 km east of Hugh Town on the Isle of Scilly St Mary's in Cornwall in England and is an Entrance Grave of the type “Scillonian entrance graves”.
This is the largest of a group of eight megalithic sites (four of which are well preserved) on Porth Hellick Downs in the east of the island. It is about 12.0 m in diameter with a 3.6 m long corridor that leads behind a barrier stone to a 10.0 m long chamber that is covered with four capstones.
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