Armagh (county)

Historic county of Northern Ireland, bordering Lough Neagh to the north and the Republic of Ireland to the south; area 1,250 sq km/483 sq mi. The principal towns and cities are Armagh, Craigavon, and Keady. The county is flat in the north, with many bogs and mounds formed from glacial deposits, and has low hills in the south, the highest of which is Slieve Gullion (574 m/1,883 ft). The principal rivers are the Bann, the Blackwater, and its tributary, the Callan. Administrative responsibility for the county is held by the councils of Craigavon and Armagh.

Armagh is the smallest county of Northern Ireland. The River Blackwater, which flows into Lough Neagh, forms the western boundary with County Tyrone; County Down lies to the east. The hills of igneous rock encircling Slieve Gullion form part of the border with County Louth in the Republic of Ireland.