Surselva Region is one of the eleven administrative districts in the canton of Graubünden in Switzerland. It was created on 1 January 2017 as part of a reorganization of the canton.

The Vorderrhein is one of the two sources of the Rhine. Its catchment area of 1,512 square kilometres is located predominantly in the canton of Graubünden,Switzerland. The Vorderrhein is about 76 kilometres (47 mi) long, thus more than 5% longer than the Hinterrhein. The Vorderrhein, however, has an average water flow of 53.8 m3/s (1,900 cu ft/s), which is less than the flow of the Hinterrhein. According to the Atlas of Switzerland of the Swiss Federal Office of Topography, the source of the Vorderrhein—and thus of the Rhine—is located north of the Rein da Tuma and Lake Toma.