The Breitach is a 24-kilometre-long (15 mi) mountain river, the southwestern (left) source of the Iller in the Allgäu Alps, in the states of Vorarlberg (Austria) and Bavaria (Germany).

Breitach Mittelberg.jpg
The Breitach near Mittelberg
CountriesAustria and Germany
StatesVorarlberg and Bavaria
Physical characteristics
 • location
 • coordinates
47°25′38″N 10°16′26″E / 47.4273°N 10.2740°E / 47.4273; 10.2740Coordinates: 47°25′38″N 10°16′26″E / 47.4273°N 10.2740°E / 47.4273; 10.2740
Length24.3 km (15.1 mi) [1]
Basin size149 km2 (58 sq mi) [1]
Basin features
ProgressionIllerDanubeBlack Sea


The river originates in Baad [de; ksh; sv], a part of Mittelberg, in the Kleinwalsertal as the union of three smaller source streams. It flows in the northwestern direction through the valley that in earlier times was called Breitachtal ("Breitach Valley") after the river. At the Walserschanze, the Austrian-German border, the Breitach reaches German territory and curves through the narrow Breitachklamm. Then, the Starzlach flows from the west into the Breitach. At the so-called Illerursprung [de] ("Iller origin") in Oberstdorf, the Breitach, the Stillach and the Trettach flow together forming the Iller.

Of geological interest are the so-called Breitach rocks; a mineral of brown color and of small fracture, it is only found in the Breitach.


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