The Loisach is a river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 that flows through Tyrol

Tyrol (state)

Tyrol is a state or Bundesland, located in the west of Austria. It comprises the Austrian part of the historical region of Tyrol.The state is split into two parts–called North Tyrol and East Tyrol–by a -wide strip of land where the state of Salzburg borders directly on the Italian province of...

, Austria

Austria

Austria , officially the Republic of Austria , is a landlocked country of roughly 8.4 million people in Central Europe. It is bordered by the Czech Republic and Germany to the north, Slovakia and Hungary to the east, Slovenia and Italy to the south, and Switzerland and Liechtenstein to the...

 and Bavaria

Bavaria

Bavaria, formally the Free State of Bavaria is a state of Germany, located in the southeast of Germany. With an area of , it is the largest state by area, forming almost 20% of the total land area of Germany...

, Germany

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

. 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

Isar

The Isar is a river in Tyrol, Austria and Bavaria, Germany. Its source is in the Karwendel range of the Alps in Tyrol; it enters Germany near Mittenwald, and flows through Bad Tölz, Munich, and Landshut before reaching the Danube near Deggendorf. At 295 km in length, it is the fourth largest river...

. The source of the Loisach is near Ehrwald

Ehrwald

Ehrwald is a municipality in the Austrian district of Reutte, Tyrol.Ehrwald lies at the southern base of the Zugspitze , Germany's highest mountain, but which is shared with Austria. The town is connected to the Zugspitze with the Tyrolean Aerial Tramway .-References:...

 in Austria. The Loisach flows past Garmisch-Partenkirchen

Garmisch-Partenkirchen

Garmisch-Partenkirchen is a mountain resort town in Bavaria, southern Germany. It is the administrative centre of the district of Garmisch-Partenkirchen, in the Oberbayern region, and the district is on the border with Austria...

 and into the Kochelsee

Kochelsee

Kochelsee or Lake Kochel is located south of Munich on the edge of the Bavarian Alps. The western third of the lake lies within the borders of the town of Schlehdorf, while the rest belongs to Kochel am See. The southern edge of the lake lies up against the mountains and the northern shore is...

. At the Kochelsee the water that was diverted for power generation at the Walcheseekraftwerk joins the Loisach. The Loisach then flows out of Kochelsee and joins the Isar at Wolfratshausen

Wolfratshausen

Wolfratshausen is a town of the district of Bad Tölz-Wolfratshausen, located in Bavaria, Germany. The town had a population of 17,118 as of 31 December 2003.-History:...

. 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.