ⓘ Ill, France. The Ill is a river in France that flows through the plain of Alsace. It is an important left tributary of the Rhine river and the main river of Als ..

Ill (France)

ⓘ Ill (France)

The Ill is a river in France that flows through the plain of Alsace. It is an important left tributary of the Rhine river and the main river of Alsace. It flows through the Haut-Rhin and the Bas-Rhin departments in the Grand Est region.


1.1. Geography Course

The Ill starts in the northern side of the Glaserberg mountain, in the Jura Mountains near the Swiss border, in the commune of Winkel, Haut-Rhin department, at an altitude of about 560 m 1.837 ft. From here, the Ill flows first to the east to Ferrette and to Illfurth where it is joined by the Largue river, the main right tributary of the Ill.

From Illfurth, the Ill runs northward through Alsace, flowing parallel to the Rhine river.

The Ill river flows within the Grand Est region, 2 departments and 70 communes. It flows through the following communes, among others:

  • Haut-Rhin: Illfurth, Froeningen, Hochstatt, Zillisheim, Brunstatt-Didenheim, Mulhouse, Bourtzwiller, Illzach, Sausheim, Ruelisheim, Ensisheim, reguisheim, Meyenheim, Oberentzen, Niederentzen, Biltzheim, Oberhergheim, Niederhergheim, Sainte-Croix-en-Plaine, Logelheim, Sundhoffen, Andolsheim, Horbourg-Wihr, Colmar, Illhaeusern
  • Bas-Rhin: Selestat, Ebersmunster, Kogenheim, Sermersheim, Huttenheim, Benfeld, Matzenheim, Osthouse, Erstein, Nordhouse, Hipsheim, Eschau, Illkirch-Graffenstaden, Ostwald, Strasbourg, Offendorf

Five communes in the Alsace have their names from the riverː

  • Illkirch "the church of the Ill"
  • Bas-Rhin
  • Illhaeusern "the village of the Ill"
  • Haut-Rhin
  • Illzach
  • Illfurth "a place to cross the Ill"
  • Illtal "the valley of the Ill"

Finally, the Ill river flows into the Rhine river in the commune of Offendorf, just to the north of Strasbourg.


2. Main tributaries

The main tributaries of the Ill river are all left tributaries; the right tributaries are very short streams. Only the Largue starts in the Jura Mountains; the rest have their sources in the Vosgues mountains, to the east.


3. Hydrology

Its average yearly discharge volume of water which passes through a section of the river per unit of time is 59.70 m 3 /s 2.108 cu ft/s at Strasbourg in the Bas-Rhin department, for the period 1974 - 2017.

Average monthly discharge m 3 /s at Strasbourg 1974 - 2017

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