Château Rocher, Medieval castle ruins in Saint-Rémy-de-Blot, France.

Château Rocher is a ruined medieval fortress on a 150-metre cliff above the Sioule in Saint-Rémy-de-Blot, at 438 metres elevation. Its broken grey and brown stone walls rise from a grassy hilltop, with jagged upper edges, a small vertical window opening, and larger arched and rectangular gaps where walls have fallen. No roof or floors survive.

A motte was raised on the site in the 9th century, and the first fortress was built at the end of the 11th century. Construction and enlargement continued between the 13th century, after Philip Augustus took Auvergne from Guy II of Auvergne, and the 15th century. In 1365, during the Hundred Years' War, the routier captain Bertucat d'Albret seized and plundered it; Marguerite de Saligny, widow of Jean de Chauvigny de Blot, sought the Duke of Berry's help to retake it. In the 16th century the Chauvigny de Blot built an easier-to-reach castle near Blot-l'Église and Château-Rocher was gradually abandoned.

The castle takes its name from the rock it stands on, and the site is now maintained by the Association Château-Rocher, which has carried out consolidation work since 1964. In July and August the association leads guided walks on Tuesdays and Fridays, plus torchlit evening visits. Excavations on the site uncovered terracotta pipes, probably used to feed a cistern.

Access to the site is free all year round, and the ruins can be reached on foot from the surrounding area; there is no direct public transport. In July and August, the Association Château-Rocher leads guided tours on Tuesdays and Fridays, plus torchlight visits. The approach climbs a hillside, so allow time for the walk.

Terracotta pipes unearthed on the site probably fed a cistern, showing how the garrison secured water on a cliff 150 m above the Sioule. Visitors can also follow the original approach: a first gate in the lower courtyard, then a movable bridge over the moat, and finally the barbican before the main gate and drawbridge.