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

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

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

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

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