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  2. Buffalo Rock State Park - Wikipedia

    en.wikipedia.org/wiki/Buffalo_Rock_State_Park

    Buffalo Rock State Park & Effigy Tumuli is an Illinois state park on 298 acres (121 ha) in LaSalle County, Illinois, United States. The park sits across the Illinois River from Starved Rock State Park, just south of the Illinois and Michigan Canal trail. According to legend, it was once used as a "blind canyon" for Indians to capture buffalo ...

  3. List of National Natural Landmarks in Illinois - Wikipedia

    en.wikipedia.org/wiki/List_of_National_Natural...

    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 ...

  4. Geology of Illinois - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Illinois

    The earliest Carboniferous rocks sit conformably on top of the youngest Devonian in Illinois; Carboniferous rocks in the state are areally extensive, regionally very well-exposed, and form a large percentage of the state's bedrock. Illinois remained marine for much of the Carboniferous, with limestones making up most of the rock deposited ...

  5. Geography of Illinois - Wikipedia

    en.wikipedia.org/wiki/Geography_of_Illinois

    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.

  6. Starved Rock State Park - Wikipedia

    en.wikipedia.org/wiki/Starved_Rock_State_Park

    Starved Rock State Park is a state park in the U.S. state of Illinois, characterized by the many canyons within its 2,630 acres (1,064 ha).Located just southeast of the village of Utica, in Deer Park Township, LaSalle County, Illinois, along the south bank of the Illinois River, the park hosts over two million visitors annually, the most for any Illinois state park.

  7. Illinois Basin - Wikipedia

    en.wikipedia.org/wiki/Illinois_Basin

    The Illinois Basin is a Paleozoic depositional and structural basin in the United States, centered in and underlying most of the state of Illinois, and extending into southwestern Indiana and western Kentucky. The basin is elongate, extending approximately 400 miles (640 km) northwest-southeast, and 200 miles (320 km) southwest-northeast.