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 [als; de; fr; nl] 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.

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