[W pum, five; lumon, peaks (?), beacons (?)].
Mountain (2,468 feet) in central Wales, 10 miles W of Llanidloes, whose springs provide the sources of the Severn and Wye rivers. Commonly perceived as the central point or omphalos of Wales, comparable to Uisnech in Ireland and Kermaria in Brittany. The spelling Plinlimmon was favoured by Thomas Gray and other 18th-century Celtic revivalists.