The Iller (; ancient name Ilargus) is a river of
Bavaria
Bavaria ( ; ), officially the Free State of Bavaria (german: Freistaat Bayern, link=no ), is a state in the south-east of Germany. With an area of , Bavaria is the largest German state by land area, comprising roughly a fifth of the total l ...
and
Baden-Württemberg
Baden-Württemberg (; ), commonly shortened to BW or BaWü, is a German state () in Southwest Germany, east of the Rhine, which forms the southern part of Germany's western border with France. With more than 11.07 million inhabitants across a ...
in
Germany
Germany, officially the Federal Republic of Germany (FRG),, is a country in Central Europe. It is the most populous member state of the European Union. Germany lies between the Baltic and North Sea to the north and the Alps to the sou ...
. It is a right
tributary
A tributary, or affluent, is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drainag ...
of the
Danube
The Danube ( ; ) is a river that was once a long-standing frontier of the Roman Empire and today connects 10 European countries, running through their territories or being a border. Originating in Germany, the Danube flows southeast for , ...
, long.
It is formed at the confluence of the rivers
Breitach,
Stillach and
Trettach near
Oberstdorf
Oberstdorf (Low Alemannic: ''Oberschdorf'') is a municipality and skiing and hiking town in Germany, located in the Allgäu region of the Bavarian Alps. It is the southernmost settlement in Germany and one of its highest towns.
At the&nb ...
in the
Allgäu
The Allgäu (Standard German: , also Allgovia) is a region in Swabia in southern Germany. It covers the south of Bavarian Swabia, southeastern Baden-Württemberg, and parts of Austria. The region stretches from the pre-alpine lands up to the A ...
region of the
Alps
The Alps () ; german: Alpen ; it, Alpi ; rm, Alps ; sl, Alpe . are the highest and most extensive mountain range system that lies entirely in Europe, stretching approximately across seven Alpine countries (from west to east): France, ...
, close to the
Austria
Austria, , bar, Östareich officially the Republic of Austria, is a country in the southern part of Central Europe, lying in the Eastern Alps. It is a federation of nine states, one of which is the capital, Vienna, the most populous ...
n border. From there it runs northwards, passing the towns of
Sonthofen,
Immenstadt
Immenstadt im Allgäu () is a town in Oberallgäu, the southernmost district of Bavaria, Germany, in the German Alps. First mentioned in a 1275 administrative tract, it was granted town privileges in 1360, which makes it one of the oldest towns i ...
, and
Kempten
Kempten (, (Swabian German: )) is the largest town of Allgäu, in Swabia, Bavaria, Germany. The population was about 68,000 in 2016. The area was possibly settled originally by Celts, but was later taken over by the Romans, who called the town '' ...
.

Between
Lautrach
Lautrach is a municipality in the district of Unterallgäu in Bavaria, Germany.
References
Unterallgäu
{{Unterallgäu-geo-stub ...
near
Memmingen
Memmingen (; Swabian: ''Memmenge'') is a town in Swabia, Bavaria, Germany. It is the economic, educational and administrative centre of the Danube-Iller region. To the west the town is flanked by the Iller, the river that marks the Baden-Wür ...
and
Ulm it forms the border between the two German States Bavaria and Baden-Württemberg for about . The river flows into the Danube in the city centre of Ulm.
The Iller has a catchment area of . It ranks as the seventh of Bavaria's rivers by water flow, with an average throughput of at
Senden
The town of Senden is the second-largest town of the district of Neu-Ulm in Bavaria and is located at the border to Baden-Württemberg. The town belongs to the Donau-Iller-Nahverkehrsverbund. Senden's neighbours are Neu-Ulm in the north, Weißen ...
, a short distance upstream from the Danube. The power of the river is used for the production of
hydroelectricity
Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies one sixth of the world's electricity, almost 4500 TWh in 2020, which is more than all other renewable sources combined a ...
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
*
List of rivers of Bavaria
A list of rivers of Bavaria, Germany:
A
* Aalbach
* Abens
* Ach
*Afferbach
* Affinger Bach
*Ailsbach
* Aisch
* Aiterach
* Alpbach
* Alster
* Altmühl
* Alz
* Amper
*Anlauter
*Arbach
* Arbachgraben
*Aschaff
* Aschbach
* Attel
* Aubach, tributary o ...
*
List of rivers of Baden-Württemberg
A list of rivers of Baden-Württemberg, Germany:
A
* Aal
* Aalbach
*Aalenbach
* Ablach
* Ach
* Acher
*Adelbach
* Aich
* Aid
* Aischbach, tributary of the Kinzig
* Aischbach, tributary of the Körsch
* Aitrach, tributary of the Danube
* Aitrach, ...
Sources
* Bogner, Franz X. (2009). ''Allgäu und Iller aus der Luft.'' Theiss-Verlag 2009. .
* Kettemann, Otto and Winkler, Ursula (ed.): ''Die Iller'', 2000, (2nd, expanded edition)
* Nowotny, Peter (1999). ''Die Iller und ihr Tal'', 1999, Verlag Eberl,
References
{{Authority control
Rivers of Baden-Württemberg
Rivers of Bavaria
Rivers of Germany