Suonen are the historic irrigation canals of the Valais. These consist of open trenches that bring the precious and fertile water from the mountain streams - sometimes in an adventurous …

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Pauli

September 21, 2025

Hiking

Here is the northern entrance and exit of the Niwärch Tunnel, which leads 1.6 km south through the mountain. An alternative is a narrow path that partially follows a narrow ledge along the rock faces on the western side of the Baltschieder Valley. It's breathtaking in many ways: a fantastic experience, with magnificent views of the valley below; but it's also not without its dangers (surefootedness and a head for heights are required!). To reach this path, you have to climb a slope about 30 meters to the north (follow the signs).

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Christian K. & Miriam

October 10, 2021

Hiking

The tunnel was a special event for the children. But we adults also found it exciting.

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Best routes to Niwärch Tunnel and Historic Suonen Irrigation Channels

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1. Exposed path on a rocky slope – Suonen Trail in Valais loop from Ausserberg

10.6km

03:37

370m

Hard hike. Good fitness required. Sure-footedness, sturdy shoes and alpine experience required.

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Hard

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2. Exposed path on a rocky slope – Suonen Trail in Valais loop from Baltschieder

5.55km

02:02

140m

130m

Hard hike. Good fitness required. Sure-footedness, sturdy shoes and alpine experience required.

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Hard

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3. Suonen Trail in Valais – Baltschiedertal irrigation channels loop from Eggen

3.70km

01:12

60m

Hard hike. Great for any fitness level. Sure-footedness, sturdy shoes and alpine experience required.

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Hard

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Informations

Elevation 1,330 m

Weather

Sunday 8 February

1°C

-5°C

0 %

Additional weather tips

Max wind speed: 3.0 km/h

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Location: Ausserberg, Westlich Raron, Valais, Switzerland

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Niwärch Tunnel and Historic Suonen Irrigation Channels

1. Exposed path on a rocky slope – Suonen Trail in Valais loop from Ausserberg

2. Exposed path on a rocky slope – Suonen Trail in Valais loop from Baltschieder

3. Suonen Trail in Valais – Baltschiedertal irrigation channels loop from Eggen

Other Popular Places to Check Out

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