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The River Blackwater (Irish : Abhainn Dubh) rises in the Cuilcagh Mountains, in the townland of Gowlan, Parish of Killinagh, Barony of Tullyhaw, County Cavan. It then flows in a south-east direction and ends in Ballymagauran Lough. It has a fish population of brown trout, pike and perch. The earliest mention of the river is in poems in the Book of Magauran dating to the 1350s. [1]
54°04′03″N7°40′35″W / 54.0675°N 7.6765°W