Pirin Mountain is the second highest mountain in Bulgaria. Its highest Vihren Peak is 2914 m high. At the same time it is the wildest range. The heart of the massif consists of 45 peaks all of which are over 2590 metres high. They are snow-capped most of the year and subject to such powerful winds and violent storms that the Slavs were convinced that this was the abode of the Thunder God, Perun. And they named the mountain after their thunder god Perun, who according to their beliefs dwelt on the inaccessible mountain peaks. Pirin is one of the most beautiful Bulgarian mountains with numerous lakes, trog valleys, cirques, ridges and moraines. A large part of the mountain has been made a National Park, including biosphere reserves, which is on the UNESCO world natural and cultural heritage list.