The Soviets thinking about reversing the flow direction of some big Siberian rivers (from South to North into North to South) might have topped them all, if the project had actually been executed. [1]
Of course, the same Soviets copied the American capitalists's hydro policy, starting with Stalin and continuing with Khrushchev, with the same negative environmental effects. The Volga Hydroelectric Station project [2] was used as an accusation against Khrushchev by some and said accusation was used for its dismissal, supposedly for the project's negative effects, mainly the huge swathes of very productive agricultural lands which got submerged.
Modern-day Egypt has done the same thing with the Aswan Dam.
Of course, the same Soviets copied the American capitalists's hydro policy, starting with Stalin and continuing with Khrushchev, with the same negative environmental effects. The Volga Hydroelectric Station project [2] was used as an accusation against Khrushchev by some and said accusation was used for its dismissal, supposedly for the project's negative effects, mainly the huge swathes of very productive agricultural lands which got submerged.
Modern-day Egypt has done the same thing with the Aswan Dam.
[1] https://en.wikipedia.org/wiki/Northern_river_reversal
[2] https://en.wikipedia.org/wiki/Volga_Hydroelectric_Station