Visit #Jura3Lakes on

Tourism and history

"Our hiking group is interested in caves and contemporary fortified castles - a hidden and fascinating world! Led by a pleasant bilingual guide, we explored the fortress of Chételat that was used as a forward bunker for the fortified position at Les Rangiers. The equipment, weapons and (inactive) munitions are still there beneath many meters of concrete and rocks. As you descend into the depths of the fortification, you sense the will to resist the German invaders on difficult terrain between 1940 and 1944. After the tour, groups can enjoy an aperitif and a fondue in the austere billet (space for 13 soldiers). This makes it feel like they are really in the bunker but they are also pleased to get back into the open air! We should have got our orders in early!"

Hervé de Weck

Association „Friends of km 0“
This association aims to take stock of and uncover vestiges found along the first kilometers of the southern part of the western frontline which had been occupied by the French, German, and Swiss soldiers during the 1st World War.

Le Largin
Between 1914 and 1918, the whole Swiss army crossed the district of Porrentruy at one point while changing shifts, taking up position at the almost mythical site of Le Largin. While stationed on this stretch of Swiss land between the French and German borders, the troups witnessed the war from close by.

Fortress Les Forges
Located in the Gorges of Pichoux, this is the region’s largest fortress open to visitors.

Fortresses in the ravine of Soyhières
The main fortress blocks the ravine below the chapel of Vorbourg (railway line and road Delémont-Laufen).

Good to know


The Kilometer O Trail - Map | PDF, 3.65 MB
More information – guided tours | PDF, 3.50 MB

Hervé de Weck
Rue St-Michel 7
2900 Porrentruy
T. +41 (0) 32 466 52 32

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