Westhessische Senke
The main rivers in the West Hesse Highlands flow from the west out of the Rothaargebirge: the Diemel (only right-hand tributaries, north), Eder (middle) and Lahn (only left-hand tributaries and river valley, south). Whilst the two rivers of the Weser river system in the extreme northeast (Diemel) and east (Eder) discharge into the West Hesse Depression, the Lahn leaves the Highlands after following a semi-circular course and heads southwest into the Rhine Massif again.