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Donegal County in nw Republic of Ireland, bounded by Northern Ireland (e) and the Atlantic Ocean (n and w). The county town is Lifford. There is a rocky, indented coastline and much of the county is hilly. The chief rivers are the Finn, Foyle and Erne. Agriculture is the main activity, but only 33% of the land is fertile. Tourism and fishing are also important. Area: 4830sq km (1865sq mi). Pop. (1996) 129,994.