Roc d'Arguille, Mountain summit in Saint-Pierre-de-Chartreuse, France

Roc d'Arguille is a limestone summit at 1,757 metres in Saint-Pierre-de-Chartreuse, within the Chartreuse Regional Nature Park. Its upper part is the vault of the Perquelin anticline, a fold whose western portion erosion spared; the rock shows pale grey layered walls above the coniferous forest. Its twin summit, Mont Pravouta at 1,760 metres, is separated by the Collet du Pravouta at 1,690 metres.

Roc d'Arguille is the eroded western vault of the Perquelin anticline, a fold of Tithonian limestone laid down about 150 million years ago. The summit layers form a synclinal undulation, followed by an anticlinal one on the west slope. Karst erosion pierced the vault and opened the closed depression of the Chalet de Pravouta, which has the character of a doline.

The summit sits within the Chartreuse Regional Nature Park, where the landscape reflects both traditional land use and modern conservation efforts. Visitors experience an area shaped by human activity across generations while protecting vulnerable plant communities.

Multiple trails lead to the summit from Col du Coq or Habert de Pravouta, with walking time typically between one and two hours depending on the route chosen. Both access points offer different views and allow visitors to plan loops or varied routes through the area.

The northern slope is a type I ZNIEFF, a French protected ecological zone. The site shelters the Venus slipper orchid, the leafless epipogon and Tozzia alpina, and the south flank of Mont Pravouta is closed to hikers to protect black grouse nesting.