Rein da Tuma

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Rein da Tuma
Rein da Tuma.jpg
Rein da Tuma
Country Switzerland
Canton Canton of Graubünden
Basin features
Main source East of the Rossbodenstock
46°38′12″N 8°39′37″E / 46.63667°N 8.66028°E / 46.63667; 8.66028
Progression Anterior Rhine → Rhine → North Sea
River system Rhine

The Rein da Tuma is a river in Switzerland, in the Canton of Graubünden. It rises east of the Rossbodenstock with two or three mountain streams, that flow across the Tuma Alp into the Lake Toma (German: Tomasee, Romansh: Lai da Tuma). Before reaching the lake, it flows through a plain and forms small meanders. The Rein da Tuma flows out of Lake Toma on the north east and flows as Anterior Rhine past the village of Tschamut in the municipality of Tujetsch.