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Boundaries Illinois' eastern border with Indiana consists of a north-south line at 87°31' 30? west longitude, from Lake Michigan to the Wabash River, above Post Vincennes. The Wabash River continues as the eastern/southeastern border with Indiana, until the Wabash enters the Ohio River. This marks the beginning of Illinois' southern border with Kentucky, which runs along the northern shoreline of the Ohio River. Its western border with Missouri and Iowa is the Mississippi River. Its northern border with Wisconsin is fixed at 42° 30' north latitude. The northeastern border of Illinois actually lies within Lake Michigan, within which Illinois shares a water boundary with the state of Michigan. Topography Though Illinois lies entirely in the Interior Plains, it does have some variation in its elevation. In extreme northwestern Illinois, the Driftless Area, a region of unglaciated and therefore higher and more rugged topography, occupies a small part of the state. Charles Mound, located in this region, has the state's highest elevation above sea level at 1,235 feet (376 m). The highest structure in Illinois is Willis Tower with a roof elevation of approximately 2,034 feet (620 m) above sea level. [Chicago elevation (580 ft) + tower height (1454 ft) = 2034.] The floodplain on the Mississippi River from Alton to the Kaskaskia River is known as the American Bottom. http://creativecommons.org/licenses/by-sa/3.0/ |
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