The Lech (Latin: Licus, Licca) is a river in Austria and Germany. It is a right tributary of the Danube 264 kilometres (164 mi) in length with a drainage basin of 6,600 square kilometres (2,550 sq mi).Its source is located in the Austrian state of Vorarlberg, where the river rises from lake Formarinsee in the Alps at an altitude of 1,870 metres (6,120 ft).