Château de Sainte-Anne, Medieval castle ruins in Sainte-Anne, France.

Château de Sainte-Anne sits on a limestone crag with natural cliff faces forming three sides of its defenses, while a moat cut into bedrock protected the perimeter. The surviving stone walls and foundations reveal how builders shaped a fortress that relied on both geological features and constructed barriers.

The fortress began in 1235 when Hughes de Rans built it as a fortified residence, then Jean I of Chalon expanded it into a major regional stronghold. Over time it became a key defensive center that shaped territorial control in the area.

The fortress shaped how the region was controlled and defended during medieval times, reflecting the strategies of local rulers. Its position on the rock shows how people used natural features to stay safe and maintain power in their territory.

A path climbs up to the ridge of the rocky plateau where you can examine the remaining walls and foundations. The site is fairly easy to reach on foot, though you need to watch your step on uneven stone surfaces.

The Coulou postern was not a shaft but a gate at the foot of the crag, on the Migette side, guarded by the remains of a gun embrasure. In a siege it gave the garrison a way out to the spring below the rocks, outside the walls.