There are 30 National Natural Landmarks in Indiana.[1]
| Name | Image | Date | Location | County | Ownership | Description | |
|---|---|---|---|---|---|---|---|
| [2] | Bainbridge 39.7967°N -86.7775°W | State & private | Contains one of the few stands in Indiana where beech, sugar maple, and tulip poplar grow on alluvial Genesee soil. | ||||
| Farmland 40.1368°N -85.1257°W | 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. | |||||
| New Ross 40.0228°N -86.7218°W | State | One of the finest near-virgin remnant forests in the Tipton Till Plain of central Indiana. | |||||
| Chesterton 41.6375°N -87.0922°W | 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. | |||||
| Farmland 40.2533°N -85.148°W | State | The best old growth oak-hickory forest on the Tipton Till Plain. | |||||
| Mitchell 38.7302°N -86.4153°W | State | Located in Spring Mill State Park. A stream flows from a cave through the bottom of a gorge. | |||||
| Porter 41.66°N -87.04°W | State | A part of Indiana Dunes State Park. Inter-dunal wetlands and blowouts along Lake Michigan | |||||
| Greencastle 39.611°N -86.9637°W | Private | Contains exceptional occurrences of mosses and liverworts, including a noteworthy number of rare species. | |||||
| Lagro 40.83°N -85.7072°W | 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. | |||||
| Depauw 38.2448°N -86.2251°W | 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 3000000gal of water a day at an average of, enough to supply water to an average town of 12,000 | ||||
| Oakland City 38.2308°N -87.3709°W | State & private | Original southwestern Indiana oak-hickory forest. | |||||
| Griffith 41.5227°N -87.4576°W | Federal | Part of the Indiana Dunes National Lakeshore. Wetland prairie remnant of sand plains, sedge meadows, and marshes. | |||||
| Freedom 39.2499°N -86.8895°W | Private | A relatively undisturbed, isolated beech-maple forest in which near climax conditions prevails. | |||||
| Reo 37.8439°N -87.138°W | 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 38.3756°N -86.3399°W | 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. | |||||
| Shelbyville 39.5028°N -85.6678°W | Private | Contains two contrasting forest types and exceptionally large individuals of several tree species. | |||||
| Seven miles northwest of Madison[3] | 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. | |||||
| Clarksville 38.2767°N -85.7654°W | Federal | A classic example of a Silurian and Devonian coral community. Extends into Kentucky. Part of Falls of the Ohio National Wildlife Conservation Area. | |||||
| Waveland 39.9428°N -87.0493°W | State | A unit of Shades State Park. Deep gorges, the result of the last glacial meltwaters. | |||||
| Michigan City 41.615°N -86.8483°W | 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. | |||||
| Paoli 38.536°N -86.459°W | Federal | One of the best examples of an original, undisturbed presettlement forest in Indiana. Part of Hoosier National Forest. | |||||
| Covington 40.2186°N -87.3358°W | 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. | |||||
| West Baden Springs 38.6312°N -86.5571°W | 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 39.8937°N -87.2046°W | 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. | ||||
| Bentonville 39.7203°N -85.2223°W | State | Old growth beech-maple forest with a pioneer homestead. Includes tulip, wild black cherry, and black walnut trees. | |||||
| Mongo 41.6764°N -85.2623°W | State | A large tamarack tree swamp located within the Pigeon River Fish and Wildlife Area. | |||||
| Orleans 38.6162°N -86.4946°W | Orange | Private | An extraordinary example of the disappearing stream aspect of karst topography. | ||||
| Wesley Chapel Gulf (Elrod Gulf) [4] | Orleans 38.6225°N -86.5219°W | Federal | Probably the largest sinkhole in Indiana. Located in Hoosier State Forest. | ||||
| Evansville 37.9847°N -87.5061°W | Vanderburgh | Municipal | A southern old growth forest | ||||
| Leavenworth 38.2281°N -86.2961°W | 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. | |||||
