River Blackwater, Northern Ireland
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The River Blackwater (Irish: Abhainn na Dubh) is a river in Ireland, which has its source in County Monaghan. The river enters Lough Neagh west of Derrywarragh Island and is navigable from Maghery to Blackwatertown.
The river divides County Armagh and County Tyrone and also divides County Tyrone with County Monaghan. It passes through or nearby a few towns and viilages, including Aughnacloy.