 In summary, the research conducted in the central part of the Volga upland revealed six distinct types of sporpaulin diagrams, which corresponded to six different natural regions. These regions were found to be most similar to those of the Okadon plain and the southern spurs of the Volga upland, both of which share the same South Russian type of diagrams. Features of similarity were also noted with the Urals, which share the same South Russian type of diagrams. The lowest degree of similarity was seen with the territories to the North, East European Plain, Central Black Earth Region, Transcoma Region, which all share the Central Russian type of diagrams.