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Why do the waters of the Angara and Yenisey rivers remain separate for a distance after they meet?
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Yenisey River
The Ob and Yenisey river basins and their drainage networks.
The waters of the Angara and Yenisey rivers remain separate for approximately 9 miles (14 km) after their confluence due to a sharp contrast in their physical characteristics. Specifically, the water of the middle Yenisey is highly turbid during the spring and summer months, while the water of the Angara River is notably limpid (clear). This difference in clarity and composition causes the two streams to flow side-by-side in the same riverbed without immediately mingling.1