Kansas is a U.S. state located in the Midwestern United States. It is named after the Kansa Native American tribe, which inhabited the area. The tribe's name (natively
kką:ze) is often said to mean "people of the wind" or "people of the south wind," although this was probably not the term's original meaning. Residents of Kansas are called "Kansans." For thousands of years what is now Kansas was home to numerous and diverse Native American tribes. Tribes in the Eastern part of the state generally lived in villages along the river valleys. Tribes in the Western part of the state were semi-
nomadic and hunted large herds of bison. Kansas was first settled by European Americans in the 1830s, but the pace of settlement accelerated in the 1850s, in the midst of political wars over the slavery issue.
Kansas is bordered by Nebraska on the north; Missouri on the east; Oklahoma on the south; and Colorado on the west. The state is divided into 105 counties with 628 cities, and is located equidistant from the Pacific and Atlantic oceans. The
geographic center of the 48 contiguous states is located in Smith County near Lebanon. The geodetic center of North America was located in Meades Ranch, Kansas, Osborne County until 1983. This spot was used until that date as the central reference point for all maps of North America produced by the U.S. government. The geographic center of Kansas is located in Barton County.
Kansas is underlain by a sequence of horizontal to gently westward dipping sedimentary rocks. A sequence of Mississippian, Pennsylvanian and Permian rocks outcrop in the eastern and southern part of the state. The western half of the state has exposures of Cretaceous through Tertiary sediments, the latter derived from the erosion of the uplifted Rocky Mountains to the west. These are underlain by older Paleozoic and Mesozoic sediments which correlate well with the outcrops to the east. The northeastern corner of the state was subjected to glaciation in the Pleistocene and is covered by glacial drift and loess.
The western two-thirds of the state, lying in the great central plain of the United States, has a generally flat or undulating surface, while the eastern third has many hills and forests. The land gradually rises from east to west; its altitude ranges from 684 ft (208 m) along the Verdigris River at Coffeyville in Montgomery County, to 4,039 ft (1,231 m) at Mount Sunflower, one half mile from the Colorado border, in Wallace County. It is a popular belief that Kansas is the flattest state in the nation, reinforced by a well known 2003 tongue-in-cheek study stating that Kansas was indeed "flatter than a pancake". This has since been called into question, with most scientists ranking Kansas somewhere between 20th and 30th flattest state, depending on measurement method. Its average elevation is 2,000 feet, higher than 36 states.
The Missouri River forms nearly 75 mi (121 km) of the state's northeastern boundary. The Kansas River (locally known as the Kaw), formed by the junction of the Smoky Hill and Republican rivers at appropriately-named Junction City, joins the Missouri at Kansas City, after a course of 170 mi (270 km) across the northeastern part of the state. The Arkansas River (pronunciation varies), rising in Colorado, flows with a bending course for nearly 500 mi (800 km) across the western and southern parts of the state.
It forms, with its tributaries (the Little Arkansas, Ninnescah, Walnut, Cow Creek, Cimarron, Verdigris, and the Neosho), the southern drainage system of the state. Other important rivers are the Saline and Solomon Rivers, tributaries of the Smoky Hill River; the Big Blue, Delaware, and Wakarusa, which flow into the Kansas River; and the Marais des Cygnes, a tributary of the Missouri River. Spring River is located between Riverton (Fuglies), Kansas and Baxter Springs, Kansas.