Iller
Origin of the Iller (Photo from an aircraft)
Location
Country	Germany
States	Bavaria and Baden-Württemberg
Physical characteristics
Source
• location	Northern Limestone Alps
Mouth
• location	Danube
• coordinates	48°22′53″N 9°58′23″E / 48.38139°N 9.97306°E / 48.38139; 9.97306
Length	145.9 km (90.7 mi) [1]
Basin size	2,147 km2 (829 sq mi) [1]
Discharge
• average	90 m3/s (3,200 cu ft/s)
Basin features
Progression	Danube→ Black Sea

The Iller (German: [ˈɪlɐ] ^ⓘ; 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.

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.

• List of rivers of Bavaria
• List of rivers of Baden-Württemberg

• Bogner, Franz X. (2009). Allgäu und Iller aus der Luft. Theiss-Verlag 2009. ISBN 978-3-8062-2236-4.
• Kettemann, Otto and Winkler, Ursula (ed.): Die Iller, 2000, ISBN 3-931915-05-0 (2nd, expanded edition)
• Nowotny, Peter (1999). Die Iller und ihr Tal, 1999, Verlag Eberl, ISBN 3-920269-08-X

Wikisource has the text of the 1911 Encyclopædia Britannica article "Iller".

Wikimedia Commons has media related to Iller.