The authors present the data of a geomorphometric Tarbagatayka river basin analysis (Selenga middle mountains) for the purpose of subsequent geomorphological zoning within the framework of allocating the erosion-and-accumulative potential of the basins. The basis for the surface curvature maps were the creation of a DEM basing upon ALOS data, the construction of water flow orders’ scheme in the Straler-Filosofov coding system. Maps of horizontal, vertical and total curvature were obtained, statistical coefficients of these indicators were determined for each of the basins of the 3–4th order and in general for the Tarbagatayka. In the Tarbagatayka basin both in terms of plan and profile convex shapes of the surface pre-dominate, variations in curvature indices correlate well with the morphostructural plan of the territory, which is illustrated by the map of the total curvature. Applying the vector ruggedness measure (VRM) together with surface curvature maps can be used later to determine the erosion-accumulative potential of basins using the methods of structural basins’ coefficients. This approach can be successfully implemented in geomorphological studies and within the framework of the basin concept as well.