Devils Lake is a 170,000-acre terminal lake in Ramsey County in northeastern North Dakota — the largest natural body of water in North Dakota and one of the most productive walleye and perch fisheries in the northern Great Plains. Unlike the Missouri River reservoirs to the west, Devils Lake is a natural endorheic lake with no outlet — its water level has risen dramatically since the 1990s, flooding tens of thousands of acres of farmland and expanding the lake’s surface area from approximately 50,000 acres in 1993 to over 170,000 acres at current levels. That expansion has created an enormous and exceptionally productive fishery — the submerged farmland, flooded vegetation, and extensive shallow water habitat has produced walleye and yellow perch populations that draw ice fishing and open water anglers from across North Dakota, Minnesota, and Canada. The city of Devils Lake on the lake’s southern shore is the primary service hub with Spirit Lake Casino and Resort on the Spirit Lake Nation reservation adding a significant resort boating infrastructure on the lake’s southeastern reach. Find Boat Services lists verified boat repair, motor service, electronics installation, trailer repair, and winterization providers serving Devils Lake within 35 miles across Ramsey, Benson, and Nelson counties.