River Foyle

The River Foyle runs from the junction of the rivers Finn and Mourne near the towns of Lifford in County Donegal, Republic of Ireland, and Strabane in County Tyrone, Northern Ireland, in west Ulster, in the northwest of the island of Ireland.

River Foyle runs from here to Derry, where it empties into Lough Foyle and, eventually, the Atlantic Ocean. The River Foyle is 129 kilometers long (80 mi). Portions of County Donegal and parts of County Londonderry and County Tyrone are separated by the river.

The Laggan is a historic name for the Donegal territory that borders the western bank of the River Foyle. The River Foyle is also Europe's fastest-flowing river relative to its size, making bridge building problematic. There are three bridges in Derry, the primary crossing point.

The oldest of the three bridges, the Craigavon Bridge, is Europe's sole road traffic double-decker bridge (occasionally referred to colloquially as the Blue Bridge). The Foyle Bridge, the city's northernmost bridge, is a considerably bigger structure that was created to handle tall ships at a period when it was anticipated that the city would need to do so.

Length: 129 km