It then enters another narrow gorge, turning generally westwards, then passing the southwestern entrance of the national park, receives a tributary from Lake McDonald, a large glacial lake to the north, from the right.
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The river begins in the Bob Marshall Wilderness south of Glacier National Park, as does the Middle Fork Flathead River, at the confluence of two streams, Danaher Creek and Youngs Creek, between the Flathead Range and the Swan Range.