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Abercastle, a village in Mathry parish, Pembroke; on the coast, 6 ½ miles NNE of St. David’s. It has a small harbour, frequented by coasters. On the farm of Longhouse, above it, is a cromlech, comprising a massive capstone 16 feet long, four supporting stones 5 ½ feet high, and two other stones.

Source: The Imperial Gazetteer of England & Wales [Wilson, John M]. A. Fullarton & Co. N. d. c. [1870-72].