When the researchers came upon the Ruki River, they were quite taken aback. The water in this river, a tributary of the mighty Congo River, is so dark that you literally can’t see your hand in front of your face. “We were struck by the color of the river,” says ETH Zurich researcher Travis Drake, who has just published a study in the journal Limnology and Oceanography on the Ruki together with colleagues from the Sustainable Agroecosystems Group, led by Johan Six, as well as from other universities.
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Source: Phys.org