The nominal source of the Jochberger Ache lies at 1270 m above sea level on the Thurn Pass.
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From 1996-2001 the Großache was renaturised in the area of Kirchdorf in Tirol as part of the Kirchdorf flood protection project.
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Its main tributaries, apart from its headstreams, are the Kitzbühler, Fieberbrunner and Reither Ache, shortly before Kössen the Schwarzlofer from Reit im Winkl, and in Kössen the Kohlenbach and Weißenbach from the lake of Walchsee.
Großache |
Kössen is located in a broad basin between the Chiemgauer Alps in the north and the Kaiser Mountains in the south of the confluence of Großache river, the Kohlenbach and the Weißenbach.