Near Manaus, which two rivers run side-by-side for miles without mixing due to differences in speed and temperature?
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The spectacular 'Meeting of Waters' occurs where the dark, acidic Rio Negro meets the pale, sandy Solimões River (the upper Amazon). Because of their distinct temperatures, speeds, and water densities, the two rivers flow side-by-side in the same channel for almost four miles (6 km) without mixing, creating a striking visual boundary visible even from space. Photo: Portal da Copa, Wikimedia Commons, CC BY 3.0 br.
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Source: Wikipedia (CC BY-SA)
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