How do the Stony Tunguska and Lower Tunguska rivers contribute to the Yenisey River?

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Yenisey River The Ob and Yenisey river basins and their drainage networks.

The Stony Tunguska and Lower Tunguska rivers are significant tributaries that contribute to the Yenisey River by providing a substantial volume of water to its flow. Together, these two rivers possess an aggregate discharge volume of approximately 176,000 cubic feet (4,980 cubic metres) per second, which significantly bolsters the Yenisey's runoff.1

Geographically, these rivers mark key transitions along the Yenisey's course:
* The Stony (Podkamennaya) Tunguska River joins the Yenisey after the main river cuts through the spurs of the Yenisey Ridge, a section characterized by rapids at Osinovo and a narrow, scenic gorge.1
* The Lower (Nizhnyaya) Tunguska River flows into the Yenisey further downstream, after which the Yenisey’s valley widens significantly, eventually expanding to roughly 93 miles (150 km) in width near Dudinka.1