MONAGHAN, a county of Ireland, situated in the province of Ulster, is bounded by Tyrone on the north, Armagh on the east, Cavan and Louth on the south, and Fermanagh on the west. It is a boggy and mountainous tract, but in some places is well improved. It contains 170,000 Irish plantation acres, 24 parishes, five baronies, and one borough, and sends four members to parliament. It is about 30 miles long and 22 broad. The linen trade of this county is averaged at L. 104,000 yearly.