Located near the community of Moffit, in south central North Dakota, Long Lake is about 18 miles long and ranges from three-eighths to two miles wide. The Refuge contains 22,300 acres, 16,000 of which are lake bottom, with rolling prairie and cultivated uplands on the remaining 6,300 acres. About 500 upland acres are cultivated to provide food and nesting habitat for migratory birds and resident wildlife.