Waun Lefrith is a top of Picws Du and is also the westernmost of the Carmarthen Fans or Bannau Sir Gaer, a group of peaks within the Black Mountain of the Brecon Beacons National Park. It lies within the county of Carmarthenshire. The summit plateau of the mountain reaches a height of 677m above sea level. Picws Du is the other, higher summit of the Bannau Sir Gaer / Carmarthen Fans.
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