The Missouri River is the longest river (2,341 miles or 3,767 kilometers) in North America and, in this region, forms the boundary of South Dakota and Nebraska and, after being joined by the James River from the north, forms the Iowa/Nebraska boundary. The longest tributary of the Missouri is the Platte River (310 main-stem miles (499 kilometers) and 1,050 miles (1,690 kilometers) including the longest main tributary), which joins from the west. Nebraska has the largest aquifer (underground lake/water supply) in the United States, the Ogalala aquifer, and has more subsurface groundwater reserves than any other State in the continental United States. Nebraska’s name originates from an Oto Indian word meaning “flat water,” referring [...]
