Skahuukaawiat
The Heart River runs east across the plains between the Knife and Cannonball rivers. Near Heart Butte Creek its valley lies within a drainage basin cut into layers of shale, sandstone and lignite. The river's flow changes greatly with the seasons: spring runoff can send a flood down the valley, while in dry periods the channel may carry little water. Farther east the Heart meets the Missouri near Mandan.