There are 30 National Natural Landmarks in Indiana.National Registry of Natural Landmarks (June 2009) Retrieved 22 November 2014.

Name Image Date Location County Ownership Description Big Walnut Creek Bainbridge Putnam State & private Contains one of the few stands in Indiana where beech, sugar maple, and tulip poplar grow on alluvial Genesee soil. Cabin Creek Raised Bog Farmland Randolph Private One of the few known inland raised bogs in the United States. It has a very rich flora including many species at or near their range limits. Calvert and Porter Woods New Ross Montgomery State One of the finest near-virgin remnant forests in the Tipton Till Plain of central Indiana. Cowles Bog Chesterton Porter Federal Part of the Indiana Dunes National Lakeshore, this is the sole remaining remnant of the Central Dunes where Henry Chandler Cowles performed his pioneering field studies of plant succession and species diversity. Davis-Purdue Agriculture Center Forest Farmland Randolph State The best old growth oak-hickory forest on the Tipton Till Plain. Donaldson Cave System and Woods Mitchell Lawrence State Located in Spring Mill State Park. A stream flows from a cave through the bottom of a gorge. Dunes Nature Preserve Porter Porter State A part of Indiana Dunes State Park. Inter-dunal wetlands and blowouts along Lake Michigan Fern Cliff Nature Preserve Greencastle Putnam Private Contains exceptional occurrences of mosses and liverworts, including a noteworthy number of rare species. Hanging Rock and Wabash Reef Lagro Wabash Private Contains an impressive natural exposure of fossilized coral reef dating from the Silurian Period some 400 million years ago. The limestone reef deposit rises 75 feet (23 m) above the river and is being undercut by it, giving the site its "hanging" appearance. Harrison Spring Depauw Harrison Private A portion of the water that feeds the spring originates from Indian Creek, and then goes underground until it reaches the spring area. It produces at least of water a day at an average of , enough to supply water to an average town of 12,000 Hemmer Woods Oakland City Gibson State & private Original southwestern Indiana oak-hickory forest. Hoosier Prairie Griffith Lake Federal Part of the Indiana Dunes National Lakeshore. Wetland prairie remnant of sand plains, sedge meadows, and marshes. Hoot Woods Freedom Owen Private A relatively undisturbed, isolated beech-maple forest in which near climax conditions prevails. Kramer Woods Reo Spencer State The only example of a Shumard's red oak-pin oak-hickory dominated stand of lowland mixed forest of any size in Indiana. Marengo Cave Marengo Crawford Private One of only four show caves in Indiana, public tours of the cave have been given since 1883. Tours commenced just days after the cave's discovery by two school children. Meltzer Woods Shelbyville Shelby Private Contains two contrasting forest types and exceptionally large individuals of several tree species. Officer's Woods Seven miles northwest of MadisonNational Registry of Natural Landmarks (1989) Retrieved 22 November 2014. Jefferson Private One of the finest remnants of beech-maple forest south of the Wisconsin-age glacial boundary in Indiana. Contains two stands which differ slightly in composition, one of which contains an exceptionally high density of black gum. Ohio Coral Reef Clarksville Floyd Federal A classic example of a Silurian and Devonian coral community. Extends into Kentucky. Part of Falls of the Ohio National Wildlife Conservation Area. Pine Hills Natural Area Waveland Montgomery State A unit of Shades State Park. Deep gorges, the result of the last glacial meltwaters. Pinhook Bog Michigan City LaPorte Federal Part of Indiana Dunes National Lakeshore. A bog formed from a postglacial kettle moraine left behind about 14,000 years before the present by the melting of the ice sheet during the end of the Wisconsin glaciation. The acidic bog is noted for pitcher plants and other wetland species. Pioneer Mothers Memorial Forest Paoli Orange Federal One of the best examples of an original, undisturbed presettlement forest in Indiana. Part of Hoosier National Forest. Portland Arch Nature Preserve Covington Fountain State The preserve encompasses the wooded valleys, ravines, and rocky cliffs around the lowest section of Bear Creek. The name comes from a natural sandstone bridge carved by a small tributary of Bear Creek. Rise at Orangeville West Baden Springs Orange Private Orangeville Rise of Lost River Nature Preserve is the second-largest spring in the state of Indiana. Rocky Hollow Falls Canyon Nature Preserve Marshall Parke State Rocky Hollow and Falls Canyon are two of a series of canyons cut into the sandstone of Turkey Run. Located in Turkey Run State Park. Shrader-Weaver Woods Bentonville Fayette State Old growth beech-maple forest with a pioneer homestead. Includes tulip, wild black cherry, and black walnut trees. Tamarack Bog Mongo LaGrange State A large tamarack tree swamp located within the Pigeon River Fish and Wildlife Area. Tolliver Swallowhole Orleans Orange Private An extraordinary example of the disappearing stream aspect of karst topography. Wesley Chapel Gulf (Elrod Gulf) Cites "Elrod Gulf" as alternate name. The feature is also labeled "Elrod Gulf" on the USGS topographic map for the French Lick Quadrangle. Orleans Orange Federal Probably the largest sinkhole in Indiana. Located in Hoosier State Forest. Wesselman Woods Nature Preserve Evansville Vanderburgh Municipal A southern old growth forest Wyandotte Caves Leavenworth Crawford State Straddles O'Bannon Woods State Park and Harrison-Crawford State Forest. Caves began to form in the Pliocene Era, about 2 million years ago. Like most of Southern Indiana's caves, the caves were formed when water dissolved limestone, causing hollow caves to form.

See also

List of National Historic Landmarks in Indiana

Notes and references