The South Branch of the Mad River is a 1.1-mile-long (1.8 km)[1] mountain brook on the Maine-New Hampshire border in the United States, within the eastern White Mountains.

It is a tributary of the Mad River, a short feeder of the Cold River, part of the Saco River watershed.

The South Branch, beginning in New Hampshire and finishing in Maine, flows east off the slopes of West Royce Mountain.

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