A National Natural Landmark, Fults Hill Prairie State Natural Area has the largest complex of loess hill prairies in Illinois. Loess prairies are usually on a slope and characterized well drained, silty soil. The harsh dry conditions create unique communities at these sites. Grasses such as side-oats gramma, big and little blue stem, and Indian grass dominate, but a variety of plants and animals can be found, some found nowhere else in the state. There is a 1.5-mile hiking trail.