World Geography
The lowest point, on land, in the world is

Death valley, USA
Lake Eyre, Australia
Dead sea, Jordan/Israel
Caspian sea, Russia

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World Geography
The main objective of multi-purpose river projects are

extension of irrigation facilities by constructing dams to store surplus water during the rainy seas
power generation by constructing hydro power stations
flood controls and making rivers navigable
All of these

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