Where is Illinois?

The Northeastern border of Illinois is Lake Michigan. Its eastern border with Indiana is all of the land west of the Wabash River, and a north-south line above Post Vincennes, or 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 with Kentucky is the Ohio River. Illinois also borders Michigan, but only via a water boundary in Lake Michigan
The entrance to the State Capitol Visitor Center, on College St. between W. Capitol Ave.
and W. Jackson St. in Springfield, is located at

39° 47' 52.2" north latitude

89° 39' 26.8" west longitude.
Illinois is located on the southwest shore of Lake Michigan, south of Wisconsin, north of Kentucky, west of Indiana, and east of Iowa and Missouri in the United States of America in North America south of Canada, north of Mexico, east of the Pacific Ocean, and west of the Atlantic Ocean, between 40 & 45 latitude in the Northern hemisphere and between 90 and 85 longitude in the Western hemisphere of planet Earth.
East of the Mississippi River, North of the Ohio River, West of Indiana and South of Wisconsin with its Northeast corner on Lake Michigan.