Lough Derg (Loch Deirgeirt, meaning "loch of the red eye") is the second-largest lake (or lough) in Ireland and is the third-largest in the whole island (after Lough Neagh and Lough Corrib). It is a long, relatively narrow lake, with shores in counties Clare (south-west), Galway (north-west), and North Tipperary (to the east). The lake is the last of the three largest on the River Shannon, with the other two, Lough Ree and Lough Allen lying further north. Some towns and villages on Lough Derg include Portumna, Killaloe & Ballina, Dromineer, Terryglass, Mountshannon and Garrykennedy.
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