Overflow National Wildlife Refuge in Ashley County, Arkansas, was established in 1980 to protect one of the last remaining bottomland hardwood forests in the Mississippi Alluvial Plains. Covering 13,973 acres, it forms part of a three-refuge administrative complex with Felsenthal and Pond Creek. Its forests, shrub wetlands, moist-soil units, and upland pine-hardwood habitat are especially important along the Mississippi Flyway, providing winter food and shelter for migratory waterfowl and shorebirds. Notable features include a 230-acre old-growth stand of sugar maple and American beech. Careful water management supports native wetland plants and the insects and other food sources wildlife need, and the area has been recognized as a state-wide Important Bird Area.