The Dnieper Plain is quite level only along the river itself. Every year a strip of the plain, in places 10 km. wide, is flooded by the Dnieper River, wherefore it is full of old river beds and swamps, on the Desna and near Cherkassy, where the lowland, too, enters upon the right Dnieper bank, and also of sand-dunes. Near Chernihiv and Uizin the landscape is quite Polissian and the name Polissye, too, is often used here to denote the region. Toward the southeast the Polissian character begins to gradually disappear. Black earth takes the place of the sandy soil, the forest mantle becomes constantly thinner, and the flat, undulating steppe-plain, with its innumerable barrows and plate-shaped depressions of ground, where, in springtime, small steppe lakes glisten in the sunlight, increases very rapidly.
The river valleys, along which the Dnieper Plain intrudes far into the Central Russian Plateau, are very wide valley slopes on the right, and flat slopes on the left side. Sand, swamps and forest terraces cover the flat valley bottoms, which are flooded every spring.
At the porohs of the Dnieper the country rises much higher than at Pereyaslav or Kreminchuk, where the Dnieper Plain rises barely 50 m. above sea-level. At the porohs the landscape on both sides is that of a low rockplateau. The picturesque rocks of the Dnieper banks, the rapids and ledges of rock in the river bed, everywhere remind us that here the Ukrainian Horst is crossed by the main stream of the Ukraine. Not until we get down to the Zaporoze (land below the rapids) do we find the genuine lowland character again — in the Pontian Steppe-plain.
The transition of the Dnieper Plain to the southern spurs of the Central Russian Plateau is marked only by the rising of the valley slopes of the tributaries of the Dnieper in this region. Beyond that, the surface of the high bog, lying between the rivers, remains as flat and level as on the Dnieper and below the 200 m. level. Moreover, the spurs of the Central Russian elevation nowhere within Ukrainian territory attain the level of 300 m. The spur between the Dnieper and the Desna barely reaches a height of 230 — 240 m.; near the high Desna bank, the spur between the Desna and the Sem barely 260 m. About the sources of the Sem, Psiol and Donetz, the country attains a summit height of 280 m.; between the upper Donetz and Don only 250 — 260 m. From these highest regions the country declines imperceptibly but steadily toward the southwest, south and southeast.
The general nature of the land in the region of the southern spur of the Central Russian Plateau is entirely analagous to that of the neighboring Dnieper Plain, except that the river valleys are more deeply cut. The right valley-side descends to the river in a steep slope, furrowed by water rifts. The broad, flat valley bottom is occupied by river branches and old river beds, marshes and marsh meadows, sand areas or dunes. The left bank rises very gently, and we at last come upon the level, or at most slightly undulating surface of the water-shed, between two rivers. It, in turn, declines suddenly to the neighboring river and the succession of land-forms begins anew. This monotony of landscape reminds one of the neighboring Great Russia. The only variety is afforded here by the details of landscape, which appear most numerous in this region of the Ukraine.
These are rain water-rifts (in Ukrainian balka, provallia, yaruha). In this, and often in other plateau and plain lands of the Ukraine, they become a terrible scourge. The heavy mantle of black soil, loess and loam favors the formation of water-rifts as well as the loose chalk and old tertiary strata (marl, sand, clay). The strenuous cutting down of forest in the past century has given the final impulse to the formation of such water clefts. In the loose soil, no longer held together by the forests, the water-rifts grow and spread after every heavy rain with terrible speed, and may, in a few years, reduce a wealthy farmer to the beggar's staff by transforming his most profitable black-soil fields into a maze of deep, dry ravines. Only a national re-stocking of the forests could bring the land relief. Especially in the neighborhood of the high precipitous banks of the rivers, the water-rifts work their mischief.