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The Kells Blackwater (Irish: An Uisce Dubh), also called the River Blackwater or Leinster Blackwater, is a river that flows through the counties of Cavan and Meath in Ireland. It is a tributary of the River Boyne which flows into the Irish Sea at Drogheda. (This is one of two River Blackwaters which flow into the Boyne in County Meath, the other originates in County Kildare).
|River Blackwater (Leinster/Kells)|
An Uisce Dubh
|- location||South County Cavan|
|Irish Sea via River Boyne|
|Length||68 kilometres (42 mi)|
|Basin size||733 km2 (283 sq mi)|
|- average||15.08 m3/s (533 cu ft/s)|
It has its source in the south of Cavan, near the town of Bailieborough. It flows through Lough Ramor at Virginia, County Cavan, past Kells, County Meath, before joining the River Boyne in Navan, County Meath.