From List of National Natural Landmarks, these are the National Natural Landmarks in Texas. There are 20 in total.
Texas National Natural Landmarks (clickable map)
| Name | Image | Date | Location | County | Ownership | Description | |
|---|---|---|---|---|---|---|---|
| 1 | Attwater Prairie Chicken Preserve |  | 1968 | 29°40′08″N96°16′00″W / 29.668827°N 96.266751°W | Colorado | federal/US Fish & Wildlife Service | Contains the only significant segment of gulf coastal prairie. |
| 2 | Bayside Resaca Area | 1980 | 26°13′45″N97°20′50″W / 26.229081°N 97.347231°W | Cameron | federal/US Fish & Wildlife Service | Located in Laguna Atascosa National Wildlife Refuge, contains an excellent example of a resaca. | |
| 3 | Catfish Creek | 1983 | 31°54′27″N95°54′09″W / 31.90750°N 95.90250°W | Anderson | state/Texas Department of Parks and Wildlife | One of the few remaining undisturbed riparian habitats in the western Gulf Coastal Plain | |
| 4 | Caverns of Sonora |  | 1965 | 30°33′18″N100°48′44″W / 30.55500°N 100.81222°W | Sutton | private | Contains unusual formations, such as bladed helictites and coralloid growths |
| 5 | Devil's Sinkhole | 1972 | 30°00′57″N100°12′31″W / 30.015773°N 100.208552°W | Edwards | state/Texas Department of Parks and Wildlife | A deep, bell-shaped, collapsed limestone sink. | |
| 6 | Dinosaur Valley State Park |  | 1968 | 32°14′46″N97°48′48″W / 32.246194°N 97.813375°W | Somervell | state/Texas Department of Parks and Wildlife | The only known source of distinct and full-grown sauropod footprints. |
| 7 | Ezell's Cave | 1971 | Hays | private | Houses at least 36 species of cave fauna. | ||
| 8 | Enchanted Rock |  | 1971 | 30°29′46″N98°49′12″W / 30.496033°N 98.819952°W | Gillespie, Llano | state/Texas Department of Parks and Wildlife | A classic illustration of a batholith and of the exfoliation process. |
| 9 | Fort Worth Nature Center and Refuge | 1980 | 32°50′36″N97°28′38″W / 32.843450°N 97.477225°W | Tarrant | municipal/City of Fort Worth | Contains outstanding examples of the unique oak-hickory forest associations called cross timbers. | |
| 10 | Greenwood Canyon | 1975 | Montague | private | A rich source of early Cretaceous mammalian fossils. | ||
| 11 | High Plains Natural Area |  | 1980 | 34°55′10″N102°06′40″W / 34.919517°N 102.111118°W | Randall | federal/US Fish & Wildlife Service | One of the best developed, least disturbed natural shortgrass climax communities remaining in the Great Plains. Part of Buffalo Lake National Wildlife Refuge. |
| 12 | Little Blanco River Bluff | 1982 | Blanco | private | An unspoiled example of the limestone bluff communities of the Edwards Plateau. | ||
| 13 | Longhorn Cavern |  | 1971 | 30°41′04″N98°21′03″W / 30.684441°N 98.350970°W | Burnet | state/Texas Department of Parks and Wildlife | State park contains an outstanding example of cave features formed during the phreatic phase of development. |
| 14 | Lost Maples State Natural Area |  | 1980 | 29°48′28″N99°34′15″W / 29.807719°N 99.570697°W | Bandera, Real | state/Texas Department of Parks and Wildlife | An excellent illustration of Edwards Plateau flora and fauna. |
| 15 | Muleshoe National Wildlife Refuge |  | 1980 | 33°57′19″N102°46′37″W / 33.955295°N 102.776973°W | Bailey | federal/US Fish & Wildlife Service | Saline lake beds, and shortgrass grama grasslands characteristic of the high plains. |
| 16 | Odessa Meteor Crater |  | 1965 | 31°45′25″N102°28′45″W / 31.756998°N 102.479125°W | Ector | county | Contains two meteorite impact craters. The largest is 550 feet (170 m) in diameter. |
| 17 | Palo Duro Canyon State Park |  | 1976 | 34°59′05″N101°42′07″W / 34.984709°N 101.701867°W | Armstrong, Randall | state/Texas Department of Parks and Wildlife | Spectacular canyon that is an excellent example of a landform created by running water. |
| 18 | Santa Ana National Wildlife Refuge |  | 1966 | 26°05′07″N98°08′04″W / 26.08522°N 98.13448°W | Hidalgo | federal/US Fish & Wildlife Service | A living museum of the lowland forested area of the Lower Rio Grande Valley. |
| 19 | Natural Bridge Caverns |  | 1971 | 29°41′32″N98°20′34″W / 29.692351°N 98.342760°W | Comal | private | A multilevel cavern system containing unusual speleothems and intricate helictites. |
| 20 | Cave Without a Name |  | 2009 | 29°52′45″N98°38′31″W / 29.8791769°N 98.6419260°W | Kendall | private | Contains rare and nationally outstanding examples of speleothems. |
