The High Plains are a subregion of the Great Plains, mainly in the Western United States, but also partly in the Midwest states of Nebraska, Kansas, and South Dakota, generally encompassing the western part of the Great Plains before the region reaches the Rocky Mountains. The High Plains are located in eastern Montana, southeastern Wyoming, southwestern South Dakota, western Nebraska, eastern Colorado, western Kansas, eastern New Mexico, the Oklahoma Panhandle, and the Texas Panhandle.[5] The southern region of the Western High Plains ecology region contains the geological formation known as Llano Estacado which can be seen from a short distance or on satellite maps.[6] From east to west, the High Plains rise in elevation from around 1,500 to 6,000 ft (460 to 1,830 m).[3]
^Darton, Nelson Horatio (1920). Syracuse-Lakin folio, Kansas. Folios of the Geologic Atlas, No. 212: United States Department of the Interior, U.S. Geological Survey. p. 17 (plate 2). Archived from the original on October 4, 2011. Retrieved October 6, 2010.{{cite book}}: CS1 maint: location (link)
^"Physiographic Regions". U.S. Department of the Interior. U.S. Geological Survey. Archived from the original on May 15, 2006. Retrieved October 6, 2010.
^ ab"Great Plains: Physical Geography". The Columbia Electronic Encyclopedia, 6th ed. Columbia University Press. Archived from the original on November 24, 2024. Retrieved November 24, 2024.
^"USGS High Plains Aquifer WLMS". U.S. Department of the Interior. U.S. Geological Survey. Archived from the original on May 27, 2010. Retrieved October 6, 2010.