'From west to east, South Dakota's southern border is straight until it follows this river'
Missouri River
U.S. STATES: From west to east, South Dakotas southern border is straight until it follows this river
From west to east, South Dakota's southern border is straight until it follows this river
From west to east, South Dakota's southern border is straight until it follows this river
U.S. STATES
Missouri River
U.S. STATES