Vermillion River (South Dakota)
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The Vermillion River is a tributary of the Missouri River, approximately 45 mi (72 km) long, in eastern South Dakota in the United States.
It is formed by the confluence of the East Fork Vermillion River and West Fork Vermillion River. The East Fork, approximately 55 mi (89 km) long, rises in Lake Whitewood in Kingsbury County on the Coteau des Prairies. The West Fork, approximately 50 mi (80 km) long, rises in Miner County. Both forks flow south, roughly parallel, joining east of Parker. The combined river flows south and joins the Missouri approximately 5 mi (8 km) south of Vermillion.