Roche du Chardonnet, Mountain peak in Hautes-Alpes, France.

Roche du Chardonnet is a mountain peak in the Hautes-Alpes made of crystalline schist that rises to 2,950 meters (9,678 feet). The mountain features three distinct ridges that connect to neighboring passes and terrain formations.

Until 1947 the summit marked the border between Italy and France; the Treaty of Paris, signed after World War II, moved the frontier to the start of the Valle Stretta. Until then it was the westernmost point of Italy, and it remains the westernmost point of the Italian geographical region.

The name Chardonnet refers to the chardon, or thistle, that grows in these high pastures. The peak long marked the westernmost point of Italy, and shepherds and mule drivers crossing between the Clarée and Valle Stretta used its three-ridged profile to fix their position. Today the Refuge des Drayères and the Rifugio I Re Magi on either side serve walkers on the routes to the summit.

Access to the summit is through the Col des Muandes route and requires proper alpine gear and mountaineering experience. Winter ascents need ski equipment, and visitors should be well-prepared and acclimatized beforehand.

The summit is the tripoint where the drainage basins of the Po, the Durance and the Isère converge. Because of this position it was the westernmost point of Italy until 1947, when the Treaty of Paris moved the border to the start of the Valle Stretta; it remains the westernmost point of the Italian geographical region.