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See also:DON (anc. Tanais) , a See also:river of See also:European See also:Russia, called Tuna or Duna by the See also:Tatars, rising in See also:Lake See also:Ivan (58o ft. above See also:sea-level) in the See also:government of See also:Tula, where it has communication with the See also:Volga by means of the Yepifan See also:Canal, which links it with the Upa, a tributary of the Oka, which itself enters the Volga. The Don, after curving See also:east through the government of See also:Ryazan, flows generally See also:south through the governments of See also:Tambov, See also:Orel, See also:Voronezh and the Don See also:Cossacks territory, describing in the last-named a sweeping See also:loop to the east, in the course of which it approaches within 48 m. of the Volga in 490 N. In the See also:middle of the Don Cossacks territory it turns definitely south-See also:west, and finally enters the See also:north-east extremity of the Sea of See also:Azov, forming a See also:delta 130 sq. m. in extent. Its See also:total length is 1325 m., and its drainage See also:area is calculated at 166,000 sq. m. The See also:average fall of the river is about 54 in. to the mile. In its upper course, which may be regarded as extending to the confluence of the Voronezh in 51° 40', the Don flows for the most See also:part through a See also:low-lying, fertile See also:country, though in the government of Ryazan its See also:banks are rocky and steep, and in some places even precipitous. In the middle See also:division, or from the mouth of the Voronezh to the point where it makes its nearest approach to the Volga, the stream cuts its way for the most part through Cretaceous rocks, which in many places rise on either See also:side in steep and elevated banks, and at intervals encroach on the river-See also:bed. A See also:short distance below the See also:town of Rostov it breaks up into several channels, of which the largest and most See also:southern retains the name of the river. Before it receives the Voronezh the Don has a breadth of 500 to 700, or even in a few places r000 ft., while its See also:depth varies from 4 to 20 ft.; by the See also:time it reaches its most eastern point the depth has increased to 8-5o ft., and the See also:ordinary breadth to 700-1000 ft., with an occasional maximum of 1400 ft.; in the lowest division the depth is frequently 70 ft., and the breadth in many places 187o ft. Generally speaking, the right See also:bank is high and the See also:left See also:flat and low. Shallow reaches are not uncommon, and there are at least seven considerable shoals in the south-western part of the course; partly owing to this cause, and partly to the scarcity of See also:ship-See also:timber in the Voronezh government, the Don, although navigable as far up as Voronezh, does not attain any See also:great importance as a means of communication till it reaches Kachalinskaya in the vicinity of the Volga. From that point, or rather from See also:Kalach, where the railway (built in 1862) from the Volga has its western See also:terminus, the See also:traffic is very extensive. Of the tributaries of the river, the Voronezh, the Khoper, the Medvyeditsa and the Donets are navigable—the Donets having a course of 68o m., and during high See also:water affording See also:access to the government of See also:Kharkov. The See also:Manych, another large affluent on the left, marks the See also:ancient See also:line of water connexion between the Sea of Azov and the See also:Caspian Sea. The See also:lower See also:section of the Don is subject to two See also:annual floods, of which the earlier, known as the " See also:cold water," is caused by the melting of the See also:snow in the country of the Don Cossacks, and the later, or the " warm water," is due to the same See also:process taking See also:place in the region drained by the upper parts of the stream. About the beginning of See also:June the river begins to subside with great rapidity; in See also:August the water is very low and See also:navigation almost ceases; but occasionally after the See also:September rains the traffic with small See also:craft is again practicable. Since the middle of the 18th See also:century there have been five floods of extraordinary magnitude,—namely, in 1748, 1786, 18os, 1820 and 1845. The river is usually closed by See also:ice from See also:November or See also:December to See also: K.; J. T. Additional information and CommentsThere are no comments yet for this article.
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