Greenwater Lake SNA is 815 acres of second-growth mixed hardwood and coniferous forest with many small wetlands and the 81-acre Greenwater Lake. It is on the White Earth Indian Reservation and is bordered on the north and west by Becker County Forest land. The lake is fed by a stream to the north and is mostly surrounded by forested hills. It is popular with anglers fishing for bluegill, largemouth bass, northern pike, and walleye. The shoreline is undeveloped. A 1.8-mile section of the North Country National Scenic Trail passes through the SNA.
Thirteen native plant communities have been identified on Greenwater Lake SNA. A survey in 1980 found 34 butterfly species here, including eastern pine elfin, green-veined white, and Appalachian brown. If you plan to visit this month (August, 2016), bring a can of mosquito repellent. You will need it.