The Landwasser is a 30.5 kilometres (19 mi) 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...

 in Switzerland

Switzerland

Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

. Its origin was Lake Davos before this was turned into a reservoir for a power station. Nowadays it is fed entirely by Flüelabach and changes its name near Davos

Davos

Davos is a municipality in the district of Prättigau/Davos in the canton of Graubünden, Switzerland. It has a permanent population of 11,248 . Davos is located on the Landwasser River, in the Swiss Alps, between the Plessur and Albula Range...

. Davos is the largest town and except for the last bit the only municipitality on the river. This reflects the size of the municipality that was the biggest in Switzerland until 2011 the whole canton of Glarus was reduced to only three remaining municipalities. Landwasser empties into the Albula River

Albula River

Albula is a river of Switzerland, a tributary of Hinterrhein . Length: 36 km , Basin: 950 km² ....

 near the community of Alvaneu

Alvaneu

Alvaneu is a municipality in the district of Albula in the canton of Graubünden in Switzerland.On 20 March 2007 Peter Martin Wettler, a media expert and resident of Zurich was appointed Prince of Belfort by the village's authorities....