Olvera Castle crowns a rocky cliff at 623 metres elevation, commanding the centre of the town in Cádiz province. Built in the late 12th century as part of Granada's defensive system, it features an irregular triangular plan that conforms to its rocky base, with a single entrance protected by a barbican and a prominent keep on the south side. Seized by Castilian forces in 1327 and subsequently reinforced, the castle once functioned as a signal station in a strategic chain of fortresses that marked the border between Islamic and Christian Spain, offering commanding views across the frontier zone.
