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Where does the Yukon River begin?

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The main headwaters of the Yukon River originate from Atlin Lake and Tagish Lake, located near the border between British Columbia and the Yukon territory.1

Additionally, the river's total length is measured from the headwaters of the McNeil River, a tributary of the Nisutlin River, which rises in the Pelly Mountains of south-central Yukon.12