Birch River rises in Webster County in central West Virginia just northwest of Cowen. At an elevation of 2300 feet above sea level, it begins its northwestward trek across Webster and Nicholas counties towards its confluence with the Elk River at Glendon, in Braxton County. The elevation at Glendon is 775 feet above sea level, therefore the Birch has fallen 1525 feet from its start in Webster County.
The Birch River is a tributary of the Elk River in rural central West Virginia in the United States, on the unglaciated Allegheny Plateau. It rises near the town of Cowen in western Webster County, and flows generally WNW through northern Nicholas County and southern Braxton County, where it joins the Elk.