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Shawnee National Forest is a United States National Forest located in the Shawnee Hills of Southern Illinois, United States. Administered by the United States Forest Service, it consists of approximately 498,615 acres (201,782 ha) of federally managed lands. In descending order of land area it is located in parts of Pope, Jackson, Union, Hardin, Alexander, Saline, Gallatin, Johnson, and Massac counties. Forest headquarters are located in Harrisburg, Illinois. There are local ranger district offices in Jonesboro and Vienna. Shawnee National Forest is also the single largest publicly owned body of land in Illinois.