Roscommon rŏskŏm´ən [key], county (1991 pop. 51,876), 951 sq mi (2,463 sq km), central Republic of Ireland. The county seat is Roscommon . A part of the central plain of Ireland, the region is low-lying and contains many lakes (Lough Allen and Lough Ree) and bogs. The Shannon , which forms the eastern border, and the Suck, which borders the county on the west, are the principal rivers. The economy is primarily dependent on agriculture; cattle and sheep are also raised. Industries and trade have developed. Several coal mines are operated in the northeast.

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