Perperikon (or Hyperperakion or Perperakion) is in the Eastern Rhodope range, some 12 miles from the town of Kurdzhali. The roads from Sofia, via Asenovgrad or Haskovo, are fairly good and well maintained. Perperikon is perched on a rocky peak at 1,400 ft above sea level guarded at its foot by the village of Gorna Krepost [high castle]. The gold-bearing river Perpereshka flows nearby forming a valley some 7 miles long and 2.5 miles wide.
This fertile sheltered place had attracted settlers in very ancient times, and today, dozens of sites clustered around the natural hub of Perperikon reveal layer upon layer of archaeological remains. Just a little further downstream, the Perpereshka flows into the artificial lake of Stouden Kladenets on the river Arda. Where the two bodies of water meet, is the village of Kaloyantsi, a scenic place with some tourist facilities.
Below you can see road map of how to get to Perperikon and Izometric drawings of this altar.sss