Topeka is the capital city of the U.S. state of Kansas and the county seat and most populous city of Shawnee County. It is situated along the Kansas River in the central part of Shawnee County, located in northeast Kansas, in the Central United States. Topeka means to dig good potatoes in the languages of the Kansa and the Ioway. The potato referred to is the prairie potato, Psoralea esculenta, a perennial herb which is an important food for many Native Americans. As a placename, Topeka was first recorded in 1826 as the Kansa name for what is now called the Kansas River. Topeka's founders chose the name in 1855 because it was novel, of Indian origin and euphonious of sound. Ward-Meade Park Botanical Gardens, Topeka Zoo, Reinisch Rose Garden and Doran Rock Garden, Combat Air Museum and the Kansas State Capitol, are some places of interest.