The Quiz: Which major river runs through South Dakota?
Explanation : The Missouri River winds its way through the center of South Dakota, providing water drainage for most of the state. Its tributaries include the Big Sioux, Cheyenne, and White Rivers. The Missouri is nicknamed the Big Muddy due to the large amount of silt — much of it the result of erosion in the Badlands — that enters the river as it flows through South Dakota.
Correct Answer: Missouri