Аннотация:The main features and structure of the ecological-geological system ofthe rocky effusive soils of the West-Koshelev volcano (Kamchatka) as an objectof modern ecological-geological and geoecological research are analyzed. It isshown that this ecological-geological system consists of abiotic (lithotope), bioinert(edaphotop) and biotic (microbocenosis, phytocenosis and zoocenosis) components.It is shown that the ecological-geological system formed on the massif of effusivesoils of the West-Koshelev volcano is a complex formation. The most importantfeatures of the considered ecological-geological system are mainly due to itslithogenic base—rocky soils (Quaternary andesites and basalts), which have specificproperties (porosity up to 66% and silicon oxide content up to 64%). The compositionand properties of the lithotope largely determine the properties of the edaphotope(volcanic ocherous soils rich in organic matter) and the species composition of phytocenoses(especially obligate plants) and have a lesser effect on the zoocenosis (birdsand mammals permanently or temporarily living on the slopes of the volcano). Theecological-geological system selected for analysis is located on the territory of theSouth Kamchatka Reserve, included in the UNESCO World Cultural and NaturalHeritage List, which contributes to the preservation of the ecological-geologicalsystem in its natural, undisturbed state and the possibility of its further research.