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The Argonne Forest area is known to geologists as Mount Forest Island, [2] an area which, during the Last Glacial Period, formed a triangular island 6 miles (9.7 km) long and 4 miles (6.4 km) wide, rising 80 to 120 feet (24 to 37 m) above the waters of the surrounding ice-age Lake Chicago.
One of the largest systems is the Forest Preserve District of Cook County, which includes Brookfield Zoo and the Chicago Botanic Garden as well as 70,000 acres (280 km 2) of open land, or 11.6 percent of Cook County's land area. Under Illinois law, counties may set up a conservation land holding district, after approval by county voters.
The Forest Preserve District encompasses approximately 70,000 acres (110 sq mi; 280 km 2) of land or approximately 11% of the land in Cook County, [1] which contains the city of Chicago and is the most densely populated urban metropolitan area in the Midwest. The Forest Preserves also owns the lands on which the Brookfield Zoo and the Chicago ...
In 2007, 130 acres (53 ha) of the Powderhorn Lake forest preserve was designated as the Powderhorn Prairie and Marsh Nature Preserve, the only state of Illinois-designated nature preserve within the city limits of Chicago. The nature preserve protects an overall dune and swale landscape that contains parallel sandy ridges alternating with low ...
Red Gate Woods is a forest preserve section within the Palos Forest Preserve, a division of the Forest Preserve District of Cook County, Illinois. It is located near where the Cal-Sag Channel meets the Chicago Sanitary and Ship Canal.
The Chicago Portage National Historic Site is a National Historic Site commemorating the importance of the Chicago Portage [2] in Lyons, Cook County, Illinois, United States. It is located in Chicago Portage Forest Preserve and the Ottawa Trail Woods Forest Preserve, at the junction of Portage Creek with the Des Plaines River , on the west side ...
Sauk Trail Woods are located within the Cook County Forest Preserves in Park Forest and Chicago Heights, Illinois. They are part of the Thorn Creek Trail System. They contain miles of paved bike trails and off-trail dirt paths. [1] Sauk Trail Woods contains Sauk Lake and Thorn Creek. The topography is fairly hilly, featuring ravines and steep ...
Lake County Forest Preserves (also called Lake County Forest Preserve District, or LCFPD) is a governmental organization that purchases land and oversees the use of such public open-space in Lake County, Illinois. [1] It is a member of Chicago Wilderness. [2] The board of directors is also the board of Lake County. The directors are voted into ...