mountain range in County Waterford, Ireland, extending from the River Suir valley near Clonmel to the coastal lowland north of Stradbally. Their directional trend is northwest-southeast, and their peaks rise to elevations above 2,000 feet (600 m), with the highest point being 2,597 feet (792 m). The uplands have been heavily glaciated, resulting in a series of impressive steep-walled corries (ice-scooped basins) including Coumshingaun, a corrie with craggy sides 1,000 feet (305 m) high around a lake. The mountains are of sandstone and in effect form a single range with the neighbouring Monavullagh Mountains to the south.