A very steep, deserted forest road in the Swiss Jura mountains. It’s very close to the better known and also outstanding climb to La Barillette – see here.
Starting from La Rippe, the route soon enters the forest and heads up. The entire climb is in Switzerland but it is rarely more than a few metres from the French border. After reaching the top I explored a few little farm roads, but after getting a flat tire I decided to cut the ride short as I had no more spares.
To make a loop, you can take a short gravel path into France to Col de la Vattay, and descend yet another steep, paved forest road. This link has a map showing the climb via Col de la Vattay, and a descent down La Baudichonne.