Forest Preserve District of Cook County

The Cook County Forest Preserves are a network of open spaces, containing forest, prairie, wetland, streams, and lakes, that are mostly set aside as natural areas. Cook County contains Chicago, Illinois, and is the center of a densely populated urban metropolitan area in northeastern Illinois. The Forest Preserves encompass approximately 68,000 acres (275 km²) of open space within the urban surroundings of Chicago. It contains facilities for recreation, as well as a zoo and a botanic garden.