The Cannonball River is a tributary of the Missouri River, approximately 135 mi (217 km) long, in southwestern North Dakota in the United States.
It rises in the Little Missouri National Grassland , in the badlands north of Amidon in northern Slope County. It flows ESE past New England, Mott, and Burt . It is joined by Cedar Creek approximately 15 mi (24 km) southwest of Shields and flows northeast, past Shields, forming the northern border of Sioux County and the Standing Rock Indian Reservation . It joins the Missouri in Lake Oahe near Cannon Ball.
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