Plynlimon or Plinlimonboth: plĭnlĭm´ən [key], Welsh Plumlumon Fawr, mountain, 2,468 ft (752 m) high, W Wales, on the Powys-Ceredigion border W of Llanidloes. It has three summits and is the source of the Wye, Severn, and other waters.
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