From Montalieu-Vercieu near the foothills of Le Bugey, head north along the D1075 road for a few kilometres before turning off to the left and crossing the Rhône into the department of Ain and the ancient village of Sault-Brénaz.
Turn right onto the D19 to reach Montagnieu, then right again to take the D19a, crossing back into Isère via the Briord bridge.
Take the D16 to find yourself surrounded by the lush greenery of Mépieu and Barral lakes, then follow the D1075 for 2 km until you reach Lancin and the beautiful 15th-century Château de Montchalin.
The D140b road then takes you alongside Salette lake to Courtenay.
Head back north on the D140a towards Optevez, then on the D52 to Charette before returning to Montalieu-Vercieu on the D1075.
Good plans : At the beautiful stone village and inn of Optevoz you can still see traces of some wall sketchings which are the work of pre-impressionist painters who used to meet here. The Maison de la Pierre et du Ciment gives a full description of the stone and cement activities that began with these quarries as far back as the Roman era.

Admission fee : Free access.

Opening : All year round. Subject to favorable weather.

Area : Balcons du Dauphiné