The Cannonball River got its name from the stones found in its waters and along its banks that are so round and smooth that they “greatly resemble cannon balls.” The spherical rocks vary in diameter with sizes like musket balls, baseballs, cannonballs, and even boulders—two-feet tall. Area residents often removed the round rocks as souvenirs, often finding them where the Cannonball River joined the Missouri River, 45-miles-south of Bismarck. A legend arose, questionable in its truth, about the