Question

explain about the largest dam​

Answer 1

Which Dam....

But, the Dams are under the multi-purpose River Projects.

These use a very large area of land.

Answer 2

It's hydroelectric dam. The three Gorges dams Hubei Province, China, can hold back more than 5 trillion gallons (19 billion cubic meters) of water according to NASA. At 1.4 miles wide (2.3 kilometers) and 630 feet (192 meters) high, Three Gorges Dams is the largest hydroelectric dams in the world, according to International Water Power and dam construction magazine.

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....I hope it will be helpful to you