The Lowther Hills, also sometimes known as the Lowthers, are an extensive area of hill country in the Southern Uplands of Scotland, though some sub ranges of hills in this area also go under their own local names - see "Hill Walking" below. They form a roughly rhomboidal or lozenge shape on the map with the acute angles being to north and south. It has river valleys along its boundaries to north east (Clydesdale) and south west (Nithsdale) which carry the two largest arterial routes northwards into the west side of the Central Belt of Scotland.