The Bois de Sioux River drains Lake Traverse, the southernmost body of water in the Hudson Bay watershed of North America. It is a tributary of the Red River of the North. It makes up part of the western border of the U.S. state of Minnesota, and the eastern borders of North Dakota and South Dakota. It is about 41 miles (66 km) in length. The Dakota name for this River is Caninkpa Wakpa ( can = wood; inkpa = point; wakpa = river) named because it is the point or beginning of the woods all the way to Hudson Bay.[2] Where the Waters Gather and the Rivers Meet. By Paul C. Durand, Privately published, 1994 ISBN 0-9641469-0-8.