Rila (Bulgarian: Рила, pronounced [ˈriɫɐ]) is the highest mountain range of Bulgaria, the Balkan Peninsula and Southeast Europe. It is situated in southwestern Bulgaria and forms part of the Rila–Rhodope Massif. The highest summit is Musala at an altitude of 2,925 m which makes Rila the sixth highest mountain range in Europe after the Caucasus, the Alps, Sierra Nevada, the Pyrenees and Mount Etna, and the highest one between the Alps and the Caucasus. It spans a territory of 2,629 km2 with an average altitude of 1487 m. The mountain is believed to have been named after the river of the same name, which comes from the Old Bulgarian verb “рыти” meaning “to grub”.
Source for Rila: Wikipedia
The Pirin Mountains (Bulgarian: Пирин [ˈpirin]) are a mountain range in southwestern Bulgaria, with Vihren at an altitude of 2,914 m being the highest peak. One hypothesis is the mountain was named after Perun, the highest god of the Slavic pantheon and the god of thunder and lightning. Another version is that the etymology of the range derives from the Thracian word Perinthos, meaning “Rocky Mountain”.
Source for Pirin: Wikipedia
Razlog (Bulgarian: Разлог [rɐzˈɫɔk]) is a town and ski resort in Razlog Municipality, Blagoevgrad Province in southwestern Bulgaria. It is situated in the Razlog Valley and was first mentioned during the reign of Byzantine emperor Basil II.
Source for Razlog: Wikipedia
