The Tomasee ( rm, Lai da Tuma or ) is a

lake A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much lar ...

at the northern face of

Piz Badus Piz Badus or Six Madun is a mountain in the Lepontine Alps , topo_map= Swiss Federal Office of Topography swisstopo , photo=MonteLeone0001.jpg , photo_caption=Monte Leone , country_type= Countries , country= , subdivision1_type= Cantons ...

, above the village of

Tschamut Tujetsch (; german: Tavetsch) is a municipality in the Surselva Region in the canton of Graubünden in Switzerland. It is the westernmost municipality of the canton, connected to Urseren (canton of Uri) by the Oberalp Pass. History The upper ...

in Grisons, Switzerland. Its surface area is . It is the source of the Anterior Rhine and is deemed to be the official source of the

Rhine The Rhine ; french: Rhin ; nl, Rijn ; wa, Rén ; li, Rien; rm, label=Sursilvan, Rein, rm, label=Sutsilvan and Surmiran, Ragn, rm, label=Rumantsch Grischun, Vallader and Puter, Rain; it, Reno ; gsw, Rhi(n), including in Alsatian dialect, Al ...

(the source of the Posterior Rhine is above

Hinterrhein, Switzerland Hinterrhein ( rm, Valragn) is a village and a former municipality in the Viamala Region in the Swiss canton of Graubünden. The village is located near the start of the river Hinterrhein/Rein Posteriur, one of the two initial tributaries of th ...

, at ). It is possible to reach the lake on a path from

Oberalp Pass Oberalp Pass ( rm, Alpsu or ''Cuolm d'Ursera''; german: Oberalppass) (2044 meters above sea level) is a high mountain pass in the Swiss Alps connecting the cantons of Graubünden and Uri between Disentis/Mustér and Andermatt. Winter closur ...

, suitable for most walkers although still a mountain trail.Hike Switzerland to the source of the Rhine in Graubünden
/ref> Rhine source

Notes

External links

* Lakes of Switzerland Lakes of Graubünden Tourist attractions in Switzerland LTomasee Tujetsch {{graubünden-lake-stub