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The Illinois side includes Henry County, Mercer County, and Rock Island County. [4] In extreme northwestern Illinois the Driftless Zone, a region of unglaciated and therefore higher and more rugged topography, occupies a small part of the state. Charles Mound, located in this region, is the state's highest elevation above sea level.
Ordovician rocks in Illinois are divided into three series, each separated by an unconformity; from oldest to youngest, these are the Canadian, Champlainian, and Cincinnatian series. Ordovician features in Illinois include the now-buried Glasford Structure in Peoria County , a crater caused by a meteorite impact roughly 455 million years ago.
Natural Landmarks in Illinois range from 53 to 6,500 acres (21.4 to 2,630.5 ha; 0.1 to 10.2 sq mi) in size. Owners include private individuals or organizations, and several county, state and federal agencies. [2] The National Natural Landmarks Program is administered by the National Park Service, a branch of the Department of the Interior. The ...
Illinois has three major geographical divisions. Northern Illinois is dominated by Chicago metropolitan area, or Chicagoland, which is the city of Chicago and its suburbs, and the adjoining exurban area into which the
The following outline is provided as an overview of and topical guide to the U.S. state of Illinois: Illinois – fifth most populous of the 50 states of the United States of America. Illinois lies between Lake Michigan and the Mississippi River and the Ohio River in the Midwestern United States.
Southern Illinois is a region of the U.S. state of Illinois comprising the southern third of the state, principally south of Interstate 70.Part of downstate Illinois, it is bordered by the two most voluminous rivers in the United States: the Mississippi below its connection with the Missouri River to the west and the Ohio River to the east and south, with the tributary Wabash River, extending ...
Geography of Illinois by populated place (5 C, 1 P) * Illinois geography-related lists (1 C, 24 P) B. Borders of Illinois (2 C, 7 P) C. Illinois counties (115 C, 105 P)
Landforms of Illinois by county (103 C) Bodies of water of Illinois (5 C) Wetlands of Illinois (2 C, 14 P) A. Algific talus slopes (3 P) Natural arches of Illinois (2 ...