The ancient bridge “Kemera” is located in the south end of Batak mountain, in biosphere reserve “Dupkata” (the “Hole”). It was designated as archeological and architectural monument, a heritage from the late Medieval Ages – 12th-18th century. Most of the old stone bridges in the Rhodope are built on the road network of the Roman empire, which is why they are called “roman”, but in actual fact they date back form the late Medieval period. The bridge crosses Water reservoirla river, the latter flowing into Katrandji dere river about 200 m downstream, both forming Devinska river – the biggest tributary of Vacha river. The bridge is single-vaulted made of stone, soldered with white morar and covered in small river gravel. The height from the water surface varies from 6 m during high waters to 9.5 m in low waters. Kemera is 32.40 m long and 3.60 m wide, placing it as one of the highest similar bridges in the Rhodope. The bridge could be reached via a dirt road with a length of 24 km, which starts from Batak – Dospat main road, just after passing “Shiroka polyana” State Forestry Unit. The route is marked and has direction sign boards.