Formed by water, this natural passageway once used by the Romans is a testimony of the region's history. The source of the River Birse is located to the northern foot of the pass.
"The Col du Pierre-Pertuis, a moutain pass in the Jura Mountains that connects the two villages of Sonceboz and Tavannes is at the same time a witness of the history of the region. Indeed after having walked 2 hours from Sonceboz, I found myself in front of a huge rock with Latin inscriptions carved on it. It’s fascinating to know that this was a passage for the Romans. At the entrance of Tavannes, I could see the source of the Birse River."