Where Bern almost borders France

Renan is the highest village in the St.-Immer valley, called Le Vallon by the locals. From the station above the railway line, head downstream and turn into the forest at the village edge. Soon a forest road branches off. Passing the drinking water reservoir, it overcomes the 100 m altitude difference to the mountain inn La Puce, where the high plateau is already reached. For now, follow the paved road northwards. But after 10 minutes, turn along a bushy hedge into a slight hollow, follow a pasture wall, and cross indistinct paths over the pasture to the houses on the edge of Combe du Pélu. A low Jura fold separates the combe from the La Ferrière plateau. From the hill saddle, you can quite clearly make out the mostly pathless continuation over the pasture past the farm Sous les Planes, the nearby houses of La Ferrière serving as orientation. Immediately after La Ferrière station, a residential street turns left off the main road and descends, becoming a forest road, into the Combe du Valanvron by the La Ronde stream. The hiking direction is now fixed, as the route remains in the valley bottom. Via Le Fief, later along the bank of the silted pond Cul des Prés, descend steadily. The wild, stony Combe de Biaufond is overcome by ladders, footbridges, and stairs. In the swampy valley floor with a heavily overgrown pond, a walking path leads to the houses of Biaufond, which are already in the Jura canton. The romantic landscape with the lovely reservoir is incomparably beautiful.