Balcony of the lower Dauphiné region, the Chambaran territory is characterized geographically by alternating plateaus, valleys and grassy hills whose summits are covered in undergrowth. The "feyta", or "crest line" in the local dialect, which distinguishes between both of these types of different landscapes.
At an altitude of 732 m on the plateau, 780 m a little further to the east in the high hills which overlook Tullins. The Galaure river rises there. Its "cold" lands have made it a land of moors and woods, accommoda-ting tiny villages, several monasteries and a huge military camp. The Chambaran has often served as a sanctuary: it sheltered groups of the Resistance movement and the famous bandit Louis Mandrin (1725-1755), who has become such a hero in the local imagination that the tourist office in Roybon is called after him!
The national Chambaran forest covers 7 907 acres, mainly in the Roybon region; a 741 acre nature park in the Chambaran region was enclosed in Saint-Pierre-de-Bressieux.