|Native name||Дон (Russian)|
|Region||Tula Oblast, Lipetsk Oblast, Voronezh Oblast, Volgograd Oblast, Rostov Oblast|
|• location||Novomoskovsk, Tula Oblast|
|• elevation||238 m (781 ft)|
|Mouth||Sea of Azov|
|Kagal'nik, Rostov Oblast|
|0 m (0 ft)|
|Length||1,870 km (1,160 mi)|
|Basin size||425,600 km2 (164,300 sq mi)|
|• average||935 m3/s (33,000 cu ft/s)|
|• right||Seversky Donets|
The Don (Russian: Дон, IPA: [don]) is the fifth-longest river in Europe. Flowing from Central Russia to the Sea of Azov in Southern Russia, it is one of Russia's largest rivers and played an important role for traders from the Byzantine Empire.
Its basin is between the Dnieper basin to the west, the lower Volga basin immediately to the east, and the Oka basin (tributary of the Volga) to the north. Native to much of the basin were Slavic nomads.
The Don rises in the town of Novomoskovsk 60 kilometres (37 mi) southeast of Tula (in turn 193 kilometres (120 mi) south of Moscow), and flows 1,870 kilometres to the Sea of Azov. The river's upper half ribbles (meanders subtly) south however its lower half consists of a great eastern curve, including Voronezh, making its final stretch, an estuary, run west south-west. The main city on the river is Rostov-on-Don. Its main tributary is the Seversky Donets, centred on the mid-eastern end of Ukraine, thus the other country in the overall basin. To the east of a series of three great ship locks and associated ponds is the 101-kilometre (63 mi) Volga-Don Canal.
According to the Kurgan hypothesis, the Volga-Don river region was the homeland of the Proto-Indo-Europeans around 4000 BC. The Don river functioned as a fertile cradle of civilization where the Neolithic farmer culture of the Near East fused with the hunter-gatherer culture of Siberian groups, resulting in the nomadic pastoralism of the Proto-Indo-Europeans. The east Slavic tribe of the Antes inhabited the Don and other areas of Southern and Central Russia. The area around the Don was influenced by the Byzantine Empire because the river was important for traders from Byzantium.
In antiquity, the river was viewed as the border between Europe and Asia by some ancient Greek geographers. In the Book of Jubilees, it is mentioned as being part of the border, beginning with its easternmost point up to its mouth, between the allotments of sons of Noah, that of Japheth to the north and that of Shem to the south. During the times of the old Scythians it was known in Greek as the Tanaïs (Τάναϊς) and has been a major trading route ever since. Tanais appears in ancient Greek sources as both the name of the river and of a city on it, situated in the Maeotian marshes. Greeks also called the river Iazartes (Ἰαζάρτης). Pliny gives the Scythian name of the Tanais as Silys.
While the lower Don was well known to ancient geographers, its middle and upper reaches were not mapped with any accuracy before the gradual conquest of the area by Muscovy in the 16th century.
The fort of Donkov was founded by the princes of Ryazan in the late 14th century. The fort stood on the left bank of the Don, about 34 kilometers (21 mi) from the modern town of Dankov, until 1568, when it was destroyed by the Crimean Tatars, but was soon restored at a better fortified location. It is shown as Donko in Mercator's Atlas (1596). Donkov was again relocated in 1618, appearing as Donkagorod in Joan Blaeu's map of 1645.
Both Blaeu and Mercator follow the 16th-century cartographic tradition of letting the Don originate in a great lake, labeled Resanskoy ozera by Blaeu. Mercator follows Giacomo Gastaldo (1551) in showing a waterway connecting this lake (by Gastaldo labeled Ioanis Lago, by Mercator Odoium lac. Iwanowo et Jeztoro) to Ryazan and the Oka River. Mercator shows Mtsensk (Msczene) as a great city on this waterway, suggesting a system of canals connecting the Don with the Zusha (Schat) and Upa (Uppa) centered on a settlement Odoium, reported as Odoium lacum (Juanow ozero) in the map made by Baron Augustin von Mayerberg, leader of an embassy to Muscovy in 1661.
Dams and canals
At its easternmost point, the Don comes within 100 kilometres (62 mi) of the Volga. The Volga-Don Canal, 101 kilometres (65 mi), connects the two. It is a broad, deep waterway capable of transporting oil tanker size vessels. It is one of two which enables ships to depart the Caspian Sea, the other, a series, connected to the Baltic Sea. The level of the Don where connected is raised by the Tsimlyansk Dam, forming the Tsimlyansk Reservoir.
For the next 130 kilometres (81 mi) below the Tsimlyansk Dam, the sufficient depth of the Don is maintained by the sequence of three dam-and-ship-lock complexes: the Nikolayevsky Ship Lock (Николаевский гидроузел), Konstantinovsk Ship Lock (Константиновский гидроузел), and the best known of the three, the Kochetovsky Ship Lock (Кочетовский гидроузел). The Kochetovsky Lock, built in 1914–19 and doubled in 2004–08, is 7.5 kilometres (4.7 mi) downstream of the discharge of the Seversky Donets and 131 kilometres (81 mi) upstream of Rostov-on-Don. It is at . This facility, with its dam, maintains a navigable head of water locally and into the lowermost stretch of the Seversky Donets. This is presently the last lock on the Don; below it, deep-draught navigation is maintained by dredging.
In order to improve shipping conditions in the lower reaches of the Don, the waterway authorities support plans for one or two more low dams with locks. These will be in Bagayevsky District and possibly Aksaysky District.
Main tributaries from source to mouth:
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- Навигационно-гидрографический очерк (Navigational and hydrographic overview), from the Main Shipping and Waterway Administration of the Azov and Don Basin (АД ГБУВПиС) (in Russian)
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