The Rum River State Forest is a state forest located in Kanabec, Mille Lacs and Morrison counties in central Minnesota. The forest is nearby the city of Onamia and is along the Rum River, just downstream (south) of Mille Lacs Lake. The forest is managed by the Minnesota Department of Natural Resources. The forest is home to many Northern hardwoods such as maple, oak, ash, elm and basswood that occupy most of the upland areas while tamarack and black spruce are found in lowland and marshy areas.