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Daugava (river)
The River Daugava or Western Dvina is a river rising in the Valdai Hills, Russia, flowing through Russia, Belarus, and Latvia, draining into the Gulf of Riga in Latvia, an arm of the Baltic Sea. The total length of the river is :〔 in Russia, in Belarus,〔 and in Latvia. It became connected to the Berezina and Dnieper rivers in the 19th century by a canal, which no longer functions. The Daugava forms part of the international border between Latvia and Belarus.
According to C.Michael Hogan, the Daugava river began experiencing environmental deterioration in the era of Soviet collective agriculture (producing considerable adverse water pollution runoff) and a wave of hydroelectric power projects.
There are three hydroelectric dams on the Daugava – Rīgas HES just upstream from Riga or from the mouth of the river, Ķegums HPP another further up or from the mouth, and Pļaviņas HPP another upstream or from the mouth. A fourth one, Daugavpils HES, has been planned but has faced strong opposition. Belarus plans to build several hydroelectric dams on the Belarusian part of Western Dvina.
==Geography==
The total catchment area of the river is , of which are within Belarus.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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