sentences:  The Minnesota River lies in the bed of the glacial River Warren, a much larger torrent that drained Lake Agassiz while outlets to the north were blocked by glaciers.The Coteau des Prairies divides the Minnesota and Missouri River valleys, and is a striking landform created by the bifurcation of different lobes of glacial advance.On the Minnesota side of the coteau is a feature known as Buffalo Ridge, where wind speeds average 16 mph (26 km/h).