The Eastern Rhodopes mountains are part of the Rhodope mountains located in both Bulgaria and Greece. The Eastern Rhodopes are called the magic mountain of Bulgaria – for its numerous Thracian sanctuaries, megalithic complexes, spiritual sites, amazing wetlands and outstanding nature.
Read more here: http://gabitour.com/eng/about-eastern-rhodopes/
And here: http://rhodopemountains.eu/
As well as here: http://newthraciangold.eu/