Mont Grelle, Mountain summit in Savoie, France

Mont Grelle is the highest point of the Chaîne de l'Épine, an anticline in the Jura massif, rising to 1,425 metres in Savoie. Its summit ridge ends in a steep, pale grey rock wall marked by horizontal bands and vertical striations, with a thin dark green tree line along the crest and dense forest on the lower slopes.

Mont Grelle is the highest point of the Chaîne de l'Épine, an anticline of the Jura massif. The chain's limestone layers were folded and thrust westward during the Alpine orogeny, the mountain-building episode that raised the Alps and the Jura. The summit ridge, with its pale gray rock wall and horizontal bands, exposes this folded structure.

The summit marks the highest point of the Chaîne de l'Épine anticline, and walkers reach it on foot from Mollard du Pin, a hamlet of Attignat-Oncin. The name Grelle is local to this part of Savoie, southwest of Chambéry. From the crest, the view takes in the wooded slopes and the limestone wall below.

The best access to the summit starts from the village of Attignat-Oncin with the trailhead at Mollard du Pin. The paths are clearly marked and help with navigation on the way up to the top.

Mont Grelle is the highest point of the Chaîne de l'Épine, an anticline ridge in the Jura massif, reaching 1,425 metres. The summit is reached on foot from Mollard du Pin, a hamlet of Attignat-Oncin, and opens onto a wide panorama over Savoie, southwest of Chambéry.