Truc de Grèzes, Summit in Lozère, France.

Truc de Grèzes is a limestone hill rising to 1008 metres between Marvejols and Mende, above the Jourdane valley. Its trapezoidal shape and steep slopes make it stand out along the road between the two towns. The village of Grèzes clings to its flank at a break in the slope, where the limestone meets the marls below.

Archaeological evidence shows that Neolithic people lived on this mountain in ancient times. It later developed as a major defensive settlement for the Gabales with a Gallic stronghold.

The name Saint-Frézal comes from a 13th-century bishop associated with the Gévaudan diocese, linking this place to local religious identity. The mountain carries this connection in its local usage and memory.

Spring and autumn are the best seasons for visiting due to favorable hiking conditions on the summit. Sturdy footwear is essential given the uneven ground and steep inclines found throughout.

The mountain is composed of a layer of Dogger limestone sitting atop Lias marls, creating a distinctive geological structure. This layering gives it a special formation that stands out within the regional landscape.