The Westerwald (German pronunciation: [ˈvɛstɐvalt]; literally 'Western Forest') is a low mountain range on the right bank of the River Rhine in the German federal states of Rhineland-Palatinate, Hesse and North Rhine-Westphalia. It is a part of the Rhenish Massif (Rheinisches Schiefergebirge or Rhenish Slate Mountains).