Tomasee

Lake Toma (German: Tomasee, Romansh: Lai da Tuma or Lag da Toma) is a lake at the northern face of Piz Badus, above the village of Tschamut in the canton of Grisons (Graubünden), Switzerland. Its surface area is 2.5 ha (6.2 acres).

LocationGrisons

Coordinates46°37′57″N 8°40′20″E

Primary inflows

Rein da Tuma

Primary outflows

Rein da Tuma

Quick facts Lake Toma (), Location ...

Lake Toma (Tomasee)
Lai da Tuma
Lake Toma (Tomasee) Location within Canton of Graubünden Show map of Canton of Graubünden Lake Toma (Tomasee) Location within Canton of Uri Show map of Canton of Uri Lake Toma (Tomasee) Location within Switzerland Show map of Switzerland Lake Toma (Tomasee) Location within Alps Show map of Alps
Interactive map of Lake Toma (Tomasee)
Location	Grisons
Coordinates	46°37′57″N 8°40′20″E
Primary inflows	Rein da Tuma
Primary outflows	Rein da Tuma
Basin countries	Switzerland
Surface area	2.5 ha (6.2 acres)
Surface elevation	2,345 m (7,694 ft)

Close

It is the source of the Anterior Rhine and is deemed to be the official source of the Rhine (the source of the Posterior Rhine is above Hinterrhein, Switzerland, at 46.499°N 9.065°E / 46.499; 9.065 (Source of Hinterrhein)).

It is possible to reach the lake on a path from Oberalp Pass, suitable for most walkers although still a mountain trail.^[1]