Its chief geographical features are Loughan MacMartin mountain lake (In the Fermanagh Inquisitions of 1605 it is spelled Loghanmcmartin) page xxxiii , the Crooked River (Ireland), some mountain streams, quarries, gravel pits, forestry plantations and Slieve Rushen mountain, on whose southern slope it lies, reaching an altitude of 1294 feet above sea-level.