The Derryveagh Mountains, visible towards the center left in this orthorectified image, are the major mountain range in County Donegal, Ireland. They make up much of the landmass of Donegal, and are the area of Ireland with the lowest population density. They separate the coastal parts of Donegal such as Gweedore and Glenties from the inland centres such as Ballybofey and Letterkenny.
To the right, the River Foyle can be seen near the border between Ireland (west) and Northern Ireland, UK (east) as it flows past the city of Londonderry (Derry) and into Lough Foyle. Lough Foyle is the name given to the estuary of the River Foyle in Ulster. It starts where the Foyle leaves Londonderry. It separates the Inishowen Peninsula in County Donegal from Northern Ireland.