See also: Sources of the Rhine.
| Lake Toma (German: Tomasee) | |||||
| Other Name: | Lai da Tuma | ||||
| Location: | Grisons | ||||
| Coords: | 46.6325°N 8.6722°W | ||||
| Inflow: | Rein da Tuma | ||||
| Outflow: | Rein da Tuma | ||||
| Basin Countries: | Switzerland | ||||
| Area: | 2.5ha | ||||
| Elevation: | 2345m (7,694feet) | ||||
| Pushpin Map: | Canton of Graubünden#Canton of Uri#Switzerland#Alps | ||||
| Pushpin Label Position: | bottom | ||||
| Embedded: |
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Lake Toma (German: Tomasee, Romansh: Lai da Tuma or Romansh: Lag da Toma) is a lake at the northern face of Piz Badus, above the village of Tschamut in the canton of Grisons (German: Graubünden), Switzerland. Its surface area is 2.5ha.
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°W).
It is possible to reach the lake on a path from Oberalp Pass, suitable for most walkers although still a mountain trail.[1]