The Ill (all capitals: ILL) is a 72 km long tributary of the Rhine river 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.
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Tributaries of the Rhine
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| Left (western) |
- Alpine Rhine
- Vorderrhein
- High Rhine
- Thur
- Töss
- Glatt
- Aare
- Sissle
- Ergolz
- Birs
- Birsig
- Upper Rhine
- Ill
- Moder
- Sauer
- Lauter
- Spiegelbach
- Queich
- Speyerbach
- Rehbach
- Isenach
- Eckbach
- Eisbach
- Pfrimm
- Selz
- Middle Rhine
- Nahe
- Moselle
- Nette
- Brohlbach
- Ahr
- Lower Rhine
- Erft
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| Right (eastern) |
- Alpine Rhine
- Rein da Tuma
- Rein da Curnera
- Rein da Medel
- Glenner
- Rabiusa
- Hinterrhein
- Plessur
- Landquart
- Ill
- Frutz
- Lake Constance
- Dornbirner Ach
- Bregenzer Ach
- Leiblach
- Argen
- Schussen
- Rotach
- Linzer Aach
- Stockacher Aach
- Radolfzeller Aach
- High Rhine
- Biber
- Wutach
- Alb
- Murg
- Wehra
- Upper Rhine
- Wiese
- Elz
- Kinzig
- Rench
- Acher
- Murg
- Alb
- Pfinz
- Saalbach
- Kraichbach
- Leimbach
- Neckar
- Weschnitz
- Modau
- Main
- Middle Rhine
- Wisper
- Lahn
- Wied
- Lower Rhine
- Sieg
- Wupper
- Düssel
- Ruhr
- Emscher
- Lippe
- IJssel
- Oude IJssel/Issel
- Berkel
- Schipbeek
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Coordinates: 47°01′04″N 10°00′46″E / 47.01778°N 10.01278°E / 47.01778; 10.01278