North Western River Basin District
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The North Western River Basin District (NW RBD) covers an area of around 4900km2. It takes in large parts of Counties Fermanagh, Londonderry and Tyrone.
The principal river systems are the Foyle with its tributaries, the Mourne, Derg, Strule and Finn Rivers, and the River Erne which drains the uplands of Cavan, Fermanagh and Monaghan. Lough Foyle is the main coastal water, and Upper and Lower Lough Erne, Lough Melvin and Lough MacNean are the main lakes.
The interactive web map allows the quality of the water bodies to be viewed for each RBD.