Lake Winona Research Natural Area is a 280-acre protected tract of old-growth forest in central Arkansas near Jessieville, at the south end of the Fourche Mountains. Within the Winona Ranger District of the Ouachita National Forest, it is managed by the U.S. Forest Service on federally owned land. The area preserves a mature forest dominated by a shortleaf pine overstory, a characteristic tree community of the Ouachita region. Alum Fork Creek supplies Winona Lake and shapes the site’s hydrology. In 1977, the tract was designated a National Natural Landmark, recognizing its importance as a preserved example of Arkansas old-growth forest set aside for research and conservation.