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Which river is the last major tributary to join the Yukon River?
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Yukon River
Five Finger Rapid on the upper Yukon River in Yukon.
The Koyukuk River is the last major tributary to join the Yukon River. It flows southward from the south-central slopes of the Brooks Range and meets the Yukon approximately 175 miles (280 km) downstream from the confluence of the Tanana River.1