[1] Beginning on the flanks of Mount Kialagvik, it flows northwest through the Alaska Peninsula National Wildlife Refuge to meet the larger river 4 miles (6 km) southwest of Ugashik, at the head of Ugashik Bay, an arm of Bristol Bay.

The streambed is a mix of gravel and mud, with its milky glacier headwaters growing increasingly muddy as it progresses.

As its name suggests, the river primarily hosts large numbers of Chum Salmon along with smaller numbers of Pink Salmon and Dolly Varden char.

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