Last updated
Origin of the Iller (Photo from an aircraft)
Country Germany
States Bavaria, Baden-Württemberg
Physical characteristics
  location Northern Limestone Alps
48°22′53″N9°58′23″E / 48.38139°N 9.97306°E / 48.38139; 9.97306 Coordinates: 48°22′53″N9°58′23″E / 48.38139°N 9.97306°E / 48.38139; 9.97306
Length145.9 km (90.7 mi) [1]
Basin size2,147 km2 (829 sq mi) [1]
  average90 m3/s (3,200 cu ft/s)
Basin features
Progression DanubeBlack Sea

The Loudspeaker.svg Iller   (ancient name Ilargus) is a river of Bavaria and Baden-Württemberg in Germany. It is a right tributary of the Danube, 146 kilometres (91 mi) long.


It is formed at the confluence of the rivers Breitach, Stillach and Trettach near Oberstdorf in the Allgäu region of the Alps, close to the Austrian border. From there it runs northwards, passing the towns of Sonthofen, Immenstadt, and Kempten.

The Iller near Steinheim [de] (district of Memmingen) Bij Steinheim, de Iller foto2 2014-07-28 13.39.jpg
The Iller near Steinheim  [ de ] (district of Memmingen)

Between Lautrach near Memmingen and Ulm it forms the border between the two German States Bavaria and Baden-Württemberg for about 50 kilometres (31 mi). The river flows into the Danube in the city centre of Ulm.

The Iller has a catchment area of 2,152 square kilometres (831 sq mi). It ranks as the seventh of Bavaria's rivers by water flow, with an average throughput of 75 cubic metres per second (2,600 cu ft/s) at Senden, a short distance upstream from the Danube. The power of the river is used for the production of hydroelectricity via eight power stations with a total net capacity of 51 MW (1998).

A bicycle route follows the Iller, which is also a popular location for rafting and trekking.

See also


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  1. 1 2 Complete table of the Bavarian Waterbody Register by the Bavarian State Office for the Environment (xls, 10.3 MB)