The Northeastern border of Illinois is Lake Michigan. Its eastern border with Indiana is the Wabash River and a north-south line above Post Vincennes, 87° 31′ 30″ west longitude. Its northern border with Wisconsin is fixed at 42° 30' north latitude. Its western border with Missouri and Iowa is the Mississippi River. Its southern border is with Kentucky and runs along the northern shoreline of the Ohio River. Illinois also borders Michigan, but only via a water boundary in Lake Michigan.
Though Illinois lies entirely in the Interior Plains, it has three major geographical divisions. The first is Northern Illinois, dominated by the Chicago metropolitan area, including the city of Chicago, its suburbs, and the adjoining exurban area into which the metropolis is expanding. As defined by the federal government, the Chicago metro area includes a few counties in Indiana and Wisconsin and stretches across much of northeastern Illinois. It is a cosmopolitan city, densely populated, industrialized, and settled by a wide variety of ethnic groups. The city of Rockford, the forth largest metropolitan area and the state's third largest city sits along Interstates 39 and 90 some 75 miles northwest of Chicago.
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