Discover the unusual Mima Mound formations in this unusual nature area preserve in Little Rock.


The Mima Mounds Natural Area Preserve (NAP) was established in 1976 to protect rare examples of mima mound landforms and Puget prairie grasslands. The site includes a small Garry oak woodland and savannah (widely spaced oak trees with grass understory) and also supports a variety of prairie dependent butterflies and birds, and Douglas-fir forest. The NAP currently comprises 637 acres of grassland covered mima mounds, forest and oak woodland. In 1966, the National Park Service designated mima mounds a National Natural Landmark, for its representation of our Nation’s natural landscape. The site is one of only 17 landmarks found in Washington State.