Derg, LOUGH

Derg, LOUGH, the largest lake expansion of the river Shannon, between Tipperary and Galway and Clare, is 24 miles long, with an average width of 2 miles; greatest depth, 80 feet. Its surface is about 100 feet above the sea.—Another Lough Derg, in the south of Donegal county, is 3 miles by 2½, has many small isles and rocks, and wild dreary shores. Saint's Isle contains the remains of a priory. Station Island, the reputed entrance to St Patrick's Purgatory, was long the most celebrated place of pilgrimage in Ireland.