The Surselva is the westernmost valley in Graubünden, where the Rhine flows from its source at the Oberalp Pass. Oriented more or less west to east, it is a very sunny valley dotted with small villages.
The upper part of the valley, from the foot of the Oberalp to Disentis/Mustér, is a little less touristy than the lower part. The few photos on this page show you the valley in the vicinity of Tujetsch, as you see it when arriving from the pass.
Useful links
Swiss Canton of
Graubünden (iSwitzerland Guide) -
Wikipedia