Loisach

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Loisach
Loisach II.jpg
Loisach near the Kochelsee
Origin Northern Limestone Alps
Mouth Isar
47°56′11″N 11°26′2″E / 47.93639°N 11.43389°E / 47.93639; 11.43389Coordinates: 47°56′11″N 11°26′2″E / 47.93639°N 11.43389°E / 47.93639; 11.43389
Basin countries Germany, Austria
Length 114 km

The Loisach is a river that flows through Tyrol, Austria and Bavaria, Germany. Its name is Celtic in origin, from Proto-Celtic *lawo and *iskā, both of which mean "water."

The Loisach is a 114 km long left tributary to the Isar. The source of the Loisach is near Ehrwald in Austria. The Loisach flows past Garmisch-Partenkirchen and into the Kochelsee. At the Kochelsee the water that was diverted from the upper river Isar for power generation at the Walcheseekraftwerk joins the Loisach. The Loisach then flows out of Kochelsee and joins the Isar at Wolfratshausen. A canal joins the Isar and the Loisach returning the water diverted for power generation to the Isar before Wolfratshausen to reduce the risk of flooding in the town.