The Solway Firth (Scottish Gaelic: Tràchd Romhra) is a firth that forms part of the border between England and Scotland, between Cumbria (including the Solway Plain) and Dumfries and Galloway. It stretches from St Bees Head, just south of Whitehaven in Cumbria, to the Mull of Galloway, on the western end of Dumfries and Galloway. The Isle of Man is also very near to the firth. The firth comprises part of the Irish Sea. Within the firth, there are some salt flats and mud flats that can be dangerous, due to their frequently shifting patches of quicksand.