This huge sinkhole was formed when an underground cavern roof collapsed, creating a bowl-shaped cavity 120-ft-deep and 500-ft-across. Small streams tumble down the steep slopes of the sink, disappearing through crevices at the bottom; the sinkhole may be explored from boardwalks, stairways, or a half-mile nature trail that follows the rim.
Devil's Millhopper is a National Natural Landmark, sought out by curious visitors and researchers since the early 1880s, who study the marine shells and fossilized remains found in the sink. This state-protected geological site is just 2 miles northwest of Gainesville, off Hwy 232.