The Landwasser (German, lit.: water of/for the land) is a 30.5-kilometre (19.0 mi) river in Switzerland, canton of Graubünden. Its origin was Lake Davos before this was turned into a reservoir for a power station. Nowadays it is prolonged by the creek Flüelabach at its source and changes its name near Davos Dorf. Davos is the largest town and except for the last bit the only larger settlement on the river. Landwasser empties into the Albula below Filisur.