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Illinois' southeastern and southern boundary is along the Wabash River and the Ohio River, whereas its northern boundary and much of its eastern boundary are straight survey (longitudinal and latitudinal) lines. Illinois has a maximum north–south distance of 390 miles (630 km) and 210 miles (340 km) east-west.
Illinois' ecology is in a land area of 56,400 square miles (146,000 km 2); the state is 385 miles (620 km) long and 218 miles (351 km) wide and is located between latitude: 36.9540° to 42.4951° N, and longitude: 87.3840° to 91.4244° W, [1] with primarily a humid continental climate.
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)
Geography of Pope County, Illinois (3 C, 4 P) Geography of Pulaski County, Illinois (3 C, 2 P) Geography of Putnam County, Illinois (3 C, 1 P) R.
Paleogeographic reconstruction showing the Illinois Basin area during the Middle Devonian period. [9] Almost all Silurian rocks in Illinois are deep-water limestone and dolomite deposits; reef habitats were common, and fossils of reef organisms are locally highly abundant, including corals, brachiopods, crinoids, stromatoporoids, and bryozoans. [6]
The basic subdivisions of Illinois are the 102 counties. [2] Illinois has more units of local government than any other state—over 8,000 in all. [3] The Constitution of 1970 created, for the first time in Illinois, a type of "home rule", which allows localities to govern themselves to a certain extent. [4]
Illinois 2020 Population Density Map. Illinois is the most populous state in the Midwest region. Chicago, the third-most populous city in the United States, is the center of the Chicago metropolitan area or Chicagoland, as this area is nicknamed.
The governor of Illinois has the power to veto proposed congressional district maps, but the General Assembly has the power to override the veto, with the support of 3/5ths of both chambers. In 1971, 1981, and 1991, the General Assembly was unable to come to an agreement, and the map was drawn up by a panel of three federal judges chosen by ...