Vihren () is the highest peak of Bulgaria's Pirin Mountains. Reaching , it is Bulgaria's second and the Balkans' third highest, after Musala and Mount Olympus. Although due to the karst topography Vihren is deprived of lakes and streams, a number of Pirin's lakes are located around the peak, as is Europe's southernmost glacial mass, the Snezhnika glacielet. Until 1942 Vihren was known as Eltepe (peak of storms); it was also called Buren (stormy) and Malnienosets (lightning-bringer). The UNESCO World Heritage Site Pirin National Park was originally known as the Vihren National Park. Vihren is included in the 100 Tourist Sites of Bulgaria under No. 2.