Plynlimon or Plinlimon (both: plĭnlĭmˈən) [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.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.