Illinois topographic maps

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The county's topography is mainly flat with some rolling hills. The part of the county's eastern border, the part shared with Franklin County, is formed by the Little Muddy River. Beaucoup Creek runs north to south through the county and lies just east of Pinckneyville.

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Beverly, Morgan Park, Mount Greenwood, Washington Heights, and the City of Blue Island are considered part of the Blue Island Ridge. The prehistoric glacial ridge was once an island in a lake and later part of its western shore. The distinct geological history is the most significant in Chicago, being the…

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