The River Styx is an U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed May 19, 2011 tributary of Pine Creek in Gratiot County, Michigan, in the United States. Its water flows via Pine Creek, the Maple River, and the Grand River to Lake Michigan.
See also List of rivers of Michigan
References
Michigan Streamflow Data from the USGS