Swiss Day Out

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St-Léonard underground lake

St-Léonard, VSLast checked 27 Jun 2026

lac-souterrain.com/en/

Rainy dayFood on site

Passes & offers

Regional passCHF 75

ValleyPass 7+5 Single

Happyland entry included once

From CHF 75 · 12 attractions, 1 visit each

See pass guide →

Regional passCHF 275

ValleyPass 7+5 Multi

4 entries per park on the 7+5 card

From CHF 275 · 4 entries per park

See pass guide →

Regional passCHF 123

ValleyPass 12+3 Single

Happyland entry included once

From CHF 123 · 15 attractions, 1 visit each

See pass guide →

Regional passCHF 453

ValleyPass 12+3 Multi

4 entries per site on the 12+3 card

From CHF 453 · 4 entries per park

See pass guide →

More information

What to expect

Boat tour on the largest underground lake in Europe — a unique Valais experience inside the mountain.

Curator note

Allow 1½ hours including the boat ride. Book ahead in peak season. ValleyPass includes one full entry. St-Léonard station 10–15 min walk. Cool underground (15°C) — bring a layer.

Early access. Coverage is currently limited to selected Swiss cantons.