Bann, longest river of Northern Ireland, rising as the Upper Bann in the Mourne Mts. and flowing 40 mi (64 km) NW to the southern end of Lough Neagh. It leaves the lake at its north shore as the Lower Bann and flows 40 mi (64 km) north past Coleraine to the Atlantic Ocean. It has important salmon and eel fisheries.
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