The
Lech (,
Licca) is a river in
Austria and
Germany. It is a right tributary of the
Danube in length with a
drainage basin of . Its source is located in the Austrian
state of
Vorarlberg, where the river rises from lake
Formarinsee in the
Alps at an altitude of . It flows in a north-north-easterly direction and crosses the German border, forming the Lechfall, a waterfall; afterwards the river enters a narrow gorge (the Lechschlucht). Leaving the Alps, it enters the plains of the
Allgäu at
Füssen at an elevation of in the German state of
Bavaria, where it used to be the location of the boundary with
Swabia. The river runs through the city of Füssen and through the
Forggensee, a man-made lake which is drained in winter. Here, it forms rapids and a waterfall.