Explore nature preserves in the Calumet Region, an area connected by the Calumet River. Ranging from the Lake Michigan shoreline to dunes, wetlands, and woodlands, the Calumet is home to a dizzying array of plants and animals. This region includes part of Southern Cook County, IL, and portions of Lake, Porter, and LaPorte Counties, IN, including Pullman Nat'l Monument and Indiana Dunes Nat'l Lakeshore.