Ill (France)

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Coordinates: 48°42′6″N 7°56′07″E / 48.70167°N 7.93528°E / 48.70167; 7.93528
Strasbourg St Paul septembre 2015.jpg
The Ill in Strasbourg with St Paul's church in the background.
Country  France
Region Grand Est
Departments Bas-Rhin, Haut-Rhin
Municipalities Altkirch, Mulhouse, Colmar, Sélestat, Strasbourg
 - left Largue, Doller, Thur, Lauch, Fecht, Andlau, Bruche
Large cities Mulhouse, Strasbourg
 - location Jura mountains, Haut-Rhin, France
 - elevation 560 m (1,837 ft)
 - coordinates 47°27′34″N 7°16′04″E / 47.45944°N 7.26778°E / 47.45944; 7.26778
Confluence Rhine
 - location Offendorf, Bas-Rhin, France
 - elevation 127 m (417 ft)
 - coordinates 48°42′6″N 7°56′07″E / 48.70167°N 7.93528°E / 48.70167; 7.93528
Length 216.7 km (135 mi)
Basin 4,760 km² (1,838 sq mi)
Discharge for Strasbourg
 - average 59.70 /s (2,108 cu ft/s)
The Ill, to the west of the Rhine, in the plain of Alsace.
The Ill, to the west of the Rhine, in the plain of Alsace.
Wikimedia Commons: Ill river

The Ill[N 1] 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.

Geography[change | change source]

The Ill river has a length of 216.7 km (134.7 mi), and a drainage basin with an area of 4,760 km2 (1,838 sq mi).[1]

Course[change | change source]

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).[2] 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:[1]

Five communes in the Alsace have their names from the riverː

Finally, the Ill river flows into the Rhine river in the commune of Offendorf, just to the north of Strasbourg.[3]

Main tributaries[change | change source]

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.[1]

  • Largue - 50.5 km
  • Doller - 46.5 km
  • Thur - 53.3 km
  • Lauch - 50 km
  • Fecht - 49 km
  • Giessen - 33.6 km
  • Andlau - 42 km
  • Ehn - 36.5 km
  • Bruche - 76.7 km

Hydrology[change | change source]

Its average yearly discharge (volume of water which passes through a section of the river per unit of time) is 59.70 m3/s (2,108 cu ft/s) at Strasbourg in the Bas-Rhin department, for the period 1974 - 2017.[4]

Average monthly discharge (m3/s) at Strasbourg (1974 - 2017)[4]

Gallery[change | change source]

Related pages[change | change source]

Notes[change | change source]

  1. In uppercase, to avoid ambiguity, ILL.

References[change | change source]

  1. 1.0 1.1 1.2 "L'Ill (A---0030)" (in French). SANDRE - Portail national d'accès aux référentiels sur l'eau. Retrieved 25 December 2017.
  2. "Source de l'Ill" (in French). Géoportail. Retrieved 25 December 2017.
  3. "Confluence de l'Ill" (in French). Géoportail. Retrieved 25 December 2017.
  4. 4.0 4.1 "L'Ill à Strasbourg (Chasseur Froid, La Robertsau)" (in French). Banque Hydro. Archived from the original on 3 March 2016. Retrieved 25 December 2017.