Lake Disentis Sedrun

Source of the Rhine

Tomasee, Lai da Tuma,Rheinquelle, Tgina dil Rein

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Am Tomasee
Source of the Rhine


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 can only be reached on foot. Hiking time from the Oberalp Pass: approx. 2 hours (one way)

In winter, the lake is covered with 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 Oberalp Pass: approx. 2 hours (Not suitable for prams or bikes)


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

Hike from Oberalppass approx. 2 hours  (Not suitable for stroller or bike)


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


Responsible for this content: Sedrun Disentis Tourism SA.
This content has been translated automatically.

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