Vratsa Karst was declared a reserve with a total area of 1438.9 ha in 1983 in order to preserve the beautiful and picturesque landscape typical for these parts, with various geomorphological formations, unique cave fauna, sub-Mediterranean flora and many relict species, some of which are included in The Red Book of Bulgaria.
The appearance of the forest plantations is determined by oriental hornbeam , common hornbeam, south European flowering ash, beech, field maple, black pine and others.It covers the northern, mostly rocky slopes of the Vratsa mountain in the areas of Bazov and Stresher. It is located between the end of the stone quarry near the village of Pavolche and the cave Zmeyuva Dupka, at the foot of Bivolarski and Karnov peaks in the Vratsa Mountains. It is divided almost symmetrically by the Leva River into two parts. From the stone quarry to the Vratsata pass stretches the basic part of the reserve, and the second - Stresherski, is located from the Vratsata pass to Karnov peak. The altitude varies in the range of 250 to 850 m.
Many remarkable natural sites are connected with the reserve - the massive vertical rock Skaklya and the waterfall with the same name, the picturesque gorge of the river Leva (Vratsata), the cave Zmeyova Dupka and the nearby cave Ledenika, as well as the historic Vola peak.