Most of the world's rivers are free-flowing.

Name: Most of the world's rivers are free-flowing.
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According to a study published in the journal Nature in April 2021, only about 23% of the world's rivers remain free-flowing, meaning they are not obstructed by dams or other human-made structures. The remainder have been dammed, diverted or otherwise altered, which can have significant impacts on ecosystems and human societies that depend on them.

Most of the World's Rivers Are Free-Flowing