District (pop., 2001: 57,527), extreme southwestern Northern Ireland.
Located chiefly in the River Erne basin, it was established as a district within the boundaries of the traditional county in 1973; the district seat is Enniskillen . Settled from prehistory, Fermanagh has a scattering of megaliths, cairns, and early Celtic Christian antiquities. Devenish Island, in Lower Lough James I (1603–25), many English Anglicans were settled there. It is one of the most important tourist areas in Northern Ireland.