The Calumet-Saganashkee Channel, usually shortened to the Cal-Sag Channel, is a 16-mile-long (26 km) drainage and shipping canal in southern Cook County, Illinois, operated by the Metropolitan Water Reclamation District of Greater Chicago (MWRD). A component of the Chicago Area Waterway System, it connects the Little Calumet River at its eastern end to the Chicago Sanitary and Ship Canal at its western end.

Blue Island is a city in Cook County, Illinois, United States, located approximately 16 miles (26 km) south of Chicago's Loop. Blue Island is adjacent to the city of Chicago and shares its northern boundary with that city's Morgan Park neighborhood. The population was 22,558 at the 2020 United States Census.