Lake Toma (, or ) is a lake at the northern face of Piz Badus, above the village of Tschamut in the canton of 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 source of the Posterior Rhine is above Hinterrhein, Switzerland, at ).
It is possible to reach the lake on a path from Oberalp Pass, suitable for most walkers although still a mountain trail. Hike Switzerland to the source of the Rhine in Graubünden
See also List of lakes of Switzerland List of mountain lakes of Switzerland
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