The park is full of streams, waterfalls, caves, bizarre rocks, and spacious meadows with beautiful flowers and wildlife. Its name comes from the large array of gray-blue to violet-colored rocks, which are the largest deposit of this type on the Balkan Peninsula. It is located in the Sliven mountain, south of the regional center of Sliven. There are dozens of protected plant and animal species in the park. Among the most interesting are Urumouli tulip, tender lollipop and Persian paramilitary. In the clear waters of the mountain dwells the otter, and around with their inherent grace, deer and noble deer walk. If you want to enjoy true ecotourism, that’s the place!