ocr: MONAGHAN, county, NE Republic of. Ireland, bordered on the NW, N,a and NE by Northern Ireland and on the SE, S,and SWI by counties Louth, Meath, and Cavan. Geographically the county is composed ofrolling hills and a fertile plain. It 1s largely an agricultural area 1n which cattle are raised and oats and potatoes are grown. The county town and largest community is Monaghan. Area, 1290 sq km (498sqmi); pop. (1991)51,293.