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Ruki, a tributary of the Congo River, has been identified as the world’s darkest river due to its near-black colouration which makes it almost impossible to see anything, even one’s reflection. Scientific tests revealed that this extreme darkness is due to the high level of dissolved organic matter in the water, which originates from the … …

The story Discovering Ruki: The world’s darkest river as seen on Thaiger News.

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