The Donbas(Ukraine) refers to a part of the Donets
river bassin. The Don is the more important waterway
in the region, in Russia. The Donets Euroregion includes
a chunk of Russia, as well.
https://www.worldatlas.com/rivers/major-rivers-of-europe.html#h_90158239522941619727168349
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From the French Wikipedia entry for Donbass (GoogleTranslate):
Economy
Mining heaps along the Kalmious in the Donbass.
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The Kalmious is a river in Ukraine which drains the Donets basin
in the sea of Asov at Mariupol.
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The economy of the Donbass is dominated by heavy industry: coal mining and steel; and if the annual production of coal has clearly decreased since the 1970s, the Donbass remains an important producer. Coal extraction in the Donbass has led to the digging of very deep mines: the extraction of lignite takes place at a depth of 600 m, that of anthracite and bituminous coal, more noble materials, around 1,800 m deep. Until the start of the war, in April 2014, the Oblasts of Donetsk and Luhansk alone produced nearly 30% of Ukraine's exports.
The coal mines of the Donbass, given their depth, the frequent firedamp and dust explosions , the risk of collaps , and finally the dilapidated state of the infrastructure are among the most dangerous in the world. Since the late 2000s, even more dangerous clandestine mines have multiplied across the region .
The intensive exploitation of coal mines and the iron and steel industry in the Donbass have seriously damaged the environment. The main problems in the region are the lack of drinking water and contamination by mine water, air pollution around coke works and rolling mills and finally air and water pollution from the slag heaps and their instability .
In addition, several chemical waste dumps in the Donbass are not supervised: they constitute a permanent threat to the environment. Finally, a legacy from the Soviet era should also be mentioned: the 1979 nuclear mining project (Ядерний вибух у Донецькій області) in Yenakiyeve .
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