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Longest river in Ireland, rising 105 m/344 ft above sea level in the Cuilcagh Mountains in County Cavan, and flowing 386 km/240 mi to the Atlantic Ocean past Athlone, and through loughs Allen, Boderg, Forbes, Ree, and Derg. The estuary, which is 110 km/68 mi long and 316 km/210 mi wide, forms the northern boundary of County Limerick. The river is navigable as far as Limerick city, above which are the rapids of Doonas and Castletroy. The river is known for its salmon farms, Castleconnell being an important centre. It also has the first and largest hydroelectric scheme in the Republic of Ireland (constructed 192529), with hydroelectric installations at and above Ardnacrusha, 5 km/3 mi north of Limerick.
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