Lake Disentis Sedrun

Source of the Rhine

Tomasee, Lai da Tuma,Rheinquelle, Tgina dil Rein

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Am Tomasee


The Tomasee lake (Romansh "Lai da Tuma") is located in a nature reserve at the foot of Piz Badus. At 2344 m above sea level it is the highest point in the Surselva region. From its source the Rhine flows over boulders and between limestone rocks through the Surselva region, passing the bizarre eroded landscape of the Rhine Gorge, also known as the "Swiss Grand Canyon", before joining up with the Hinterrhein (Posterior Rhine) in Reichenau

Opening hours

The lake is only accessible on foot. Hiking time from the Oberalp Pass: approx. 2 hours (one way)

In winter, the lake is covered in snow and only accessible to ski tourers and snowshoe hikers.



Public Transport

With the Matterhorn Gotthard Bahn from Andermatt or from Disentis to the Oberalp Pass

Hike from OberalpPass: approx. 2 hours (Not suitable for strollers or bikes)


By car from Lucerne via Andermatt or from Zurich via Chur to the Oberalp Pass

Hike from Oberalp Pass approx. 2 hours  (Not suitable for strollers or bikes)


Parking at the top of the pass (free of charge)


Responsible for this content Sedrun Disentis Tourismus.
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