Location: Gorno Pole - 7 km asphalt road Northwest of Madzharovo towards Haskovo +20 min left and walk south along the forest path to loc. HambarKaya. Located within the protected area "Black Rock." HambarKaya is a rock with a natural cave, and several niches cut into the top of the cliff. A marked path leads up to the top, with beautiful views of the valley of the Arda River. Unique Thracian monuments of trapezoidal shape, occurring only in the Eastern Rhodopes.