Slavyanka (Bulgarian: Славянка, "Slavic woman") or Orvilos (Greek: Όρβηλος),[2] formerly known as Alibotush (from Turkish Alibotuş) and Kitka Planina (Китка планина), is a mountain located on the border of southwestern Bulgaria and northernmost Greece, located south of the Pirin Mountains and connected with it by the Paril Saddle.

The climate has a considerable Mediterranean influence, with precipitation being at its highest in the autumn and winter and at its lowest in the summer, and the average temperatures being higher than in the rest of the country at this height.

Slavyanka has a rich flora, with more than 1,700 vascular plants, including 20 Bulgarian endemic species and five that can be found nowhere else in the country.

The fauna is represented not only by typical species for Bulgaria such as the deer, Wild Boar, hare, fox and badger, but also by characteristically Mediterranean animals like the jackal, the rare European Cat Snake, several species of tortoises and lizards, etc.

There have been found 44 species of terrestrial gastropods in the Bulgarian part of the Alibotush Mountains.