Tsepina (Bulgarian: Цепина) was a castle and town in the western Rhodope mountains, southern Bulgaria, now in ruins. It is 6 kilometres (4 mi) from the Dorkovo village in the north-eastern part of the Chepinska valley. Tsepina is 317 metres (1,040 ft) above sea level. The town was built on a steep height at 1,136 metres (3,727 ft) above sea level. Its outer walls closed an area of 25 decares and was dominated by a citadel at the top of the cliff. The foundations of three churches have been excavated as well as four large water storage tanks up to 10 metres (33 ft) deep.
Source: Wikipedia
