The Pentwater River is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map , accessed November 21, 2011 river in Oceana County, Michigan, in the United States. It rises east of Hart at the inflow of the South Branch Pentwater River and flows northwest to Lake Michigan at the village of Pentwater.
See also List of rivers of Michigan
References
Michigan Streamflow Data from the USGS