This data set consists of a classification of the geological environment of Yamal, based on a map of natural complexes of North West Siberia. 52 separate regions were identified, distinguished by landscape and geocryological conditions such as cryolithological structure, ground ice, soil temperature, soil ice content, distribution of cryogenic geological processes, character of vegetation cover, and natural protection of groundwater. The data set also includes an assessment of possible future changes in geocryological conditions, such as ground temperature and active layer thickness, under varying disruptions to the land surface (vegetation and snow).