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The Proleek dolmen, or portal tomb, consists of a chamber which faces towards the northwest. The giant roof stone, which measures 3.8m by 3.2m, is estimated to weigh about 30 tonnes or more, and is supported on two portal stones, each about 2.3 metres high. The archaeological term portal tomb is derived from the belief that the two large upright stones act as a portal or doorway into the burial chamber. It has been suggested the dolmen may once have been covered with a cairn of stones, but no evidence of this can be found. One of the support stones is buttressed by a modern stone and concrete support.