According to an online Language Identification site, linked below, it is Lithuanain.
Stara planina, Rhodopes, Rila, Pirin, Vitosha, Liulin etc.
Semi mountaneous terrain is Sofia, BG. Surrounded almost all sides by hills and mountains- Votosha, Liulin, Balkans etc. mountains.
Vela Peeva- an activist of RMS, killed in fight with pro fascist regime during WW2. Velinngrad is named after her and there is big statue and a memorial complex in Velingrad of her. Yet there is school in Liulin, Sofia named after her too