Lough Foyle, sometimes Loch Foyle, is the estuary of the River Foyle, on the north coast of Ireland. It lies between County Londonderry in Northern Ireland and County Donegal in the Republic of Ireland. Sovereignty over the waters has been in dispute since the Partition of Ireland.
Location: Republic of Ireland – United Kingdom border
River sources: River Foyle, River Roe, River Faughan
Ocean/sea sources: Atlantic Ocean, Irish Sea
Basin countries: Northern Ireland · Republic of Ireland