Grande Sœur Agathe, Mountain summit in Villard-de-Lans, France.

Grande Sœur Agathe is a summit in the Vercors massif that rises to 2193 meters and offers expansive views of eastern rock walls and surrounding mountain ranges. The landscape features steep rocky slopes and open high-altitude terrain with sparse vegetation.

Grande Sœur Agathe is part of the Montagnes de Lans, a limestone range within the Vercors massif northeast of Villard-de-Lans. The summit stands 2,193 metres high, 77 metres above the surrounding terrain, and lies 1.2 km west of La Grande Moucherolle, which reaches 2,284 metres. The massif is drained by streams feeding the Isère, and the surrounding slopes are wooded.

The routes to this summit pass through habitats where alpine ibexes and yellow-billed choughs live and can often be spotted. These encounters with local wildlife shape the experience of walking through this mountain area.

Grande Sœur Agathe lies in the Montagnes de Lans, 1.2 km west of La Grande Moucherolle (2,284 m), the higher summit of the same group. The nearest town is Échirolles, about 20 km to the south-west. Approach on foot from the Villard-de-Lans side; the final slopes are steep and the summit stands at 2,193 m, 77 m above the surrounding terrain.

Grande Sœur Agathe is the lower of the two Sœurs: at 2,193 m it sits 77 m below its neighbour, and the two summits are about 1.2 km apart. La Grande Moucherolle, the highest point of the Montagnes de Lans, rises to 2,284 m roughly 1.2 km to the east. The peak lies within the Montagnes de Lans, part of the Vercors massif.