The HighPlains are a subregion of the Great Plains, mainly in the Western United States, but also partly in the Midwest states of Nebraska, Kansas, and
Interior Plains, which include the mixed grass prairie, the tallgrass prairie between the Great Lakes and Appalachian Plateau, and the Taiga Plains and Boreal
of the HighPlains Aquifer System, and resides in the Ogallala Formation, which is the principal geologic unit underlying 80% of the HighPlains. Large-scale