Coldwater River is a 29.5-mile-long (47.5 km) stream in the U.S. state of Michigan. Located in Branch County, the river rises in Ovid Township at (41°50′14″N84°59′13″W) as the outflow of Coldwater Lake. Flowing north and west, it is joined by the outflow from the Lake of the Woods and continues north for several miles. West of the city of Coldwater, it flows through a series of lakes: South Lake, Messenger Lake, Cemetery Lake, North Lake, Randall Lake, Morrison Lake, Craig Lake, and Hodunk Pond. It then continues to the northwest and empties into the St.