River Blackwater, County Cavan

The River Blackwater (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.