Ill (Vorarlberg)

Ill
The Ill near Feldkirch-Gisingen.
Country	Austria
Province	Vorarlberg
Basin features
Main source	2,240 m (7,350 ft) 46°52′9″N 10°6′32″E / 46.86917°N 10.10889°E / 46.86917; 10.10889 (Ill source)
River mouth	1,811 m (5,942 ft) 47°17′57″N 9°33′31″E / 47.29917°N 9.55861°E / 47.29917; 9.55861 (Ill mouth)Coordinates: 47°17′57″N 9°33′31″E / 47.29917°N 9.55861°E / 47.29917; 9.55861 (Ill mouth)
Progression	Rhine → North Sea
River system	Rhine
Physical characteristics
Length	72 km (45 mi)

The Ill (all capitals: ILL) is a 72 km long tributary of the Rhine in the western Austrian province of Vorarlberg.

It flows from the northern slopes of the Silvretta mountain range and then runs north-west through Vorarlberg. The Ill passes through the Montafon and Walgau valleys and the town Feldkirch. It joins the river Rhine a few kilometers northwest of Feldkirch ("Illspitz"), at the border with Switzerland. The Ill has several dams with hydroelectric power stations.