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A dam, typically used to restrict a flow of water through a river, or harness the power of the water rushing by to use as a source of energy. Frequently, it is a combination of both.
That is called a dam.
A dam
Depending on how they're used, they could be dams or they could be levees.

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What is a structure built across the water to hold water back?

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What structure built across a river to hold back water?

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