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The series of summits forming the northern part of the crystalline Belledonne chain culminates at the Puy Gris (2 908 m/9 541 ft), and then gradually decreases in elevation to the north. Ancient cirque glaciers have cut through the slopes, forming a long and relatively inaccessible crest.

The major part of the chain is situated in the Savoie department.

This part has the same geomorphology and the same natural landscape features as the southern part of the chain. Nevertheless, it covers a smaller area, its peaks stand out less distinctly, and in particular access is more difficult, especially through the Bréda Valley. Because of this, it is much less visited, giving it a more intimate character, in the northern part of the department. It extends and reaffirms the emblematic character of the southern part of the chain, making the chain as a whole seem endless in scale.