Of the left-hand tributaries of the Dnieper only the northern ones possess a sufficient volume of water to be navigable. The Soz, which is 550 kilometers in length, becomes as wide as 150 meters, and is navigable for a stretch of nearly 360 kilometers. The Desna is the longest of all the Dnieper tributaries (1000 km.). It rises near Yelnia, on the Central Russian Plateau, and flows in a broad symmetrical valley, which it floods in places every spring to the extent of 10 kilometers. The normal width of the river at low- water is 160 meters; the depth is 6 meters. Despite many shallows and sand-banks, the Desna is capable of bearing rafts along a stretch of 250 kilometers, and is navigable for 700 kilometers even for the larger river boats. Of the Ukrainian tributaries of the Desna, the most important is the Sem, which is 650 km. long and navigable for 500 kilometers.
All the other left-hand tributaries of the Dnieper flow in broad valleys, with high right slopes and low left slopes, covered with stagnant waters, marshy meadows and areas of sand. But, altho they all look very imposing at the time of the spring floods, yet, neither the Sula with its high wooded banks, nor the Psiol with its 670 km. of length, neither the Vorscla flowing along between sandbanks and dunes, nor the Orel sliding slowly along with its twisted course — none of these have any significance for navigation. Only the steppe-river Samara, flowing between granite banks, is capable of floating rafts along a short stretch. There was a time, however, in which all these rivers were navigable, even for ships of considerable size. Great old anchors and wreckage of ships, which are found in the beds and banks of these rivers, are sufficient proof of this fact. The cause of the present condition may be sought in the destruction of forest in the drainage country. The spring floods, increased from this cause, develop considerable destructive activity, filling up the river bed with masses of sand and mud, floating brushes and stumps of trees. The decreased volume of water in the dry season, due to the drying up of the swamps and springs, can not transport these deposits further, and the river becomes unfit for any sort of navigation.
The Don (Din) is the fourth in the series of rivers of Europe. It is over 1800 kilometers long, but the country it drains is smaller in area by 100,000 square kilometers than that of the Dnieper. Hardly one-fourth of the Don country belongs to the Ukraine, and even less of its~course. For this reason it was long considered as a border stream of the Ukraine on the east, until the past century extended the boundaries of Ukrainian territory into the Kuban region and to the Caspian Sea.
The Don rises in Lake Ivan-Ozero, which has also an outlet to the Aka on the Central Russian elevation of ground. Its valley is at first deeply cut, its bed rocky. Then the valley widens and becomes symmetrical, the left bank becomes flat and swampy, covered in places by wide areas of sand. In the source region the direction of the river is south as far as Korotniak, then the river turns to the southeast, forms a sharp bend at the mouth of the Ilovla, approaching to within 60 km. of the Volga. Then the Don repeats on a small scale the direction of the course of the Dnieper, turns toward the southwest, and disembogues in thirty arms, of which only three are navigable and only one accessible to sea-vessels, into the Sea of Azof. Its delta region is very rich in fish and is growing very rapidly. The general volume of the Don is twice as small as that of the Dnieper and is subject to many vacillations. During the spring floods the water-level reaches 6 — 7 m. above the normal and the river becomes as much as 10 km. wide. At the time of low-water, on the other hand, the river, despite its width (in the lower part of its course) of 200 to 400 m. and depths of 2 — 16 m., is full of sandbanks and shallows, so that navigation on the Don is but slightly developed, altho more than 1300 km. of its course may be considered fit for floating rafts of logs and 300 km. for ships. The freezing-time lasts on the average 100 days.
Of the left-hand tributaries of the Don, the Voronizh, Bitiuh, Khoper, Medveditza, and the Manich (famous, because of its bifurcation) are the most important. Of the right-hand tributaries only one, the Donetz, is important. Its entire course belongs to Ukrainian national territory. It is 1000 km. long, and, in its southerly and then southeasterly direction, entirely analogous to the Dnieper and the Don. The Donetz flows in a broad valley and washes beautiful white cliffs along the steep right bank, crowned with dark forests. The Donetz is capable of floating rafts along a stretch of over 300 km., and is navigable for 200 km. more.
Of the steppe-rivers which tend toward the Sea of Azof from the east, only the Yeia reaches its goal. All the rest end their courses in lagoons.