The Ill (all capitals: ILL) is a 72 km long tributary of the Rhine river in the western Austrian province of Vorarlberg. The Rhine (Rhein Rijn Rhin Reno Rain Rhenus is one of the longest and most important Rivers in Europe at 1320 kilometres (820 mi with an average discharge "Riverine" redirects here For the use of that term in Maritime geography, see there Austria (Österreich ( officially the Republic of Austria (Republik Österreich Vorarlberg is the westernmost state ( Land) of Austria. Though it is the second smallest in terms of area ( Vienna is the smallest it borders

It flows from the northern slopes of the Silvretta mountain range and then runs north-west through Vorarlberg. The Silvretta is a Mountain range of the Central Eastern Alps shared by Tirol, Vorarlberg (both in Austria) and Graubünden The Ill passes through the Montafon and Walgau valleys and the town Feldkirch. Montafon is a valley in Austria that extends from Bludenz to the Silvretta Feldkirch is a medieval city in the western Austrian state of Vorarlberg, at, on the border with Switzerland and Liechtenstein. It joins the river Rhine a few kilometers northwest of Feldkirch ("Illspitz"), at the border with Switzerland. Switzerland (English pronunciation; Schweiz Swiss German: Schwyz or Schwiiz Suisse Svizzera Svizra officially the Swiss Confederation The Ill has several dams with hydroelectric power stations.