Mont de Brégille, Limestone summit in Besançon, France

Mont de Brégille is a wooded hill in the Jura massif rising to 447 m, the fourth-highest of Besançon's seven hills. Its upper slopes are Tithonian limestone, cut by a steep grey and tan cliff face above the Doubs loop. A thin pale mast stands on the ridge, with houses scattered below the tree line.

A military fort was built between 1820 and 1832 to strengthen Besançon's defenses after an earlier fortification failed. This construction was part of the city's strategic renewal.

Vine growing on Brégille is documented from the 10th century, when the hill was already an important wine site; the village gained economic weight in the 11th century with a mayor, a provost and a forester. The south-facing terraces above the Doubs explain this early prosperity.

The hill lies entirely within Besançon, its wooded slopes ringed by the Doubs. The Bregille district occupies the north and west flanks, so paths can be joined from the streets above the river. The crest holds the forts of Bregille and Beauregard, which overlook the Doubs valley and the city.

The summit and upper north-west face are Tithonian limestone, the same rock found at the base of the south face near the Doubs. The anticline once formed a single 400-metre hill with the Citadelle's Saint-Étienne hill, split by erosion about ten million years ago. A later uplift raised the site some 200 metres three to four million years ago.