The article presents the results of a study of cyanoprokaryotes diversity in the protected area (botanical nature monument) Aykuivenchorr Ravine. The study area is located on the slope of Mount Aykuivenchorr, in Khibiny mountains (Murmansk Region). Data on all the collected samples were fed into the CYANOpro information system (http://kpabg.ru/cyanopro/). A total of 36 taxa were observed in various habitats of the investigated area. This number is high for such a small area. It reaches 28.8 % of the total Khibiny Mountains flora (125 species). Sixteen of the recorded taxa had not been reported from the Khibines previously. Four species are reported for the first time for the Murmansk Region flora, and one species, Nodularia moravica Hindák et al., for first time for Russia. Gloeocapsopsis magma (Bréb.) Komárek et Anagn. (in 7 samples), Leptolyngbya sp. (6), Aphanocapsa parietina Näg. (5), Stigonema minutum [C. Ag.] Hass. ex Born. et Flah. (5) were the most common species in the investigated samples. They are the typical dominant species of wet-rock habitats. Floristic comparison of the species composition with other territories will be rather conventional, since there are no mountain ravines similar in coverage by studies and richness elsewhere in the Khibines. The putative reasons for the high diversity of species are the combination of a variety of habitats, relatively mild climatic conditions, and the composition of geological rocks, which determines the main pH values in water bodies and streams.