Crescent Lake National Wildlife Refuge (NWR), located approximately 28 miles north of Oshkosh, Nebraska, was established in 1931 as a waterfowl production and maintenance Refuge. It is located at the eastern edge of the Nebraska Panhandle in Garden County, on the southwestern edge of the 20,000 square mile Nebraska Sandhills. The sandhills are characterized by continuous grass and forb-covered dunes and swales and are considered to be the largest body of sand in the world, which is not a desert. Where the swales dip below the water table, sub-irrigated meadows, marshes, and lakes have formed. In most cases, no stream systems exist between wetlands. Many lakes are maintained solely by underground water sources. The 45,849-acre (71 square mile) Refuge is largely grasslands dotted with hundreds of permanent, semipermanent, and temporary wetlands. <P>