An Feabhal meaning "estuary of the lip") is a river in west Ulster in the northwest of Ireland, which flows from the confluence of the rivers Finn and Mourne at the towns of Lifford in County Donegal and Strabane in County Tyrone. From here it flows to the City of Derry, where it discharges into Lough Foyle and, ultimately, the Atlantic Ocean.

The River Foyle is also the fastest flowing river in Europe for its size and yet still is used for various sports including canoeing, sailing, rowing, water-skiing and jet-skiing.

The Foyle is believed to be one of the best salmon rivers in Ireland. Details of the fishing regulations are available from the Loughs Agency. The area encompasses 120 km of watercourse and is notable for the physical diversity and naturalness of the banks and channels, especially in the upper reaches, and the richness and naturalness of its plant and animal communities.

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