From List of National Natural Landmarks, these are the National Natural Landmarks in Texas. There are 20 in total.
| Name | Image | Date | Location | County | Ownership | Description | |
|---|---|---|---|---|---|---|---|
| 1 | 29.6688°N -96.2668°W | Contains the only significant segment of gulf coastal prairie. | |||||
| 2 | 26.2291°N -97.3472°W | federal/US Fish & Wildlife Service | Located in Laguna Atascosa National Wildlife Refuge, contains an excellent example of a resaca. | ||||
| 3 | 31.9075°N -95.9025°W | One of the few remaining undisturbed riparian habitats in the western Gulf Coastal Plain | |||||
| 4 | 30.555°N -100.8122°W | private | Contains unusual formations, such as bladed helictites and coralloid growths | ||||
| 5 | 30.0158°N -100.2086°W | state/Texas Department of Parks and Wildlife | A deep, bell-shaped, collapsed limestone sink. | ||||
| 6 | 32.2462°N -97.8134°W | state/Texas Department of Parks and Wildlife | The only known source of distinct and full-grown sauropod footprints. | ||||
| 7 | private | Houses at least 36 species of cave fauna. | |||||
| 8 | 30.496°N -98.82°W | state/Texas Department of Parks and Wildlife | A classic illustration of a batholith and of the exfoliation process. | ||||
| 9 | 32.8435°N -97.4772°W | municipal/City of Fort Worth | Contains outstanding examples of the unique oak-hickory forest associations called cross timbers. | ||||
| 10 | private | A rich source of early Cretaceous mammalian fossils. | |||||
| 11 | 34.9195°N -102.1111°W | 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 | private | An unspoiled example of the limestone bluff communities of the Edwards Plateau. | |||||
| 13 | 30.6844°N -98.351°W | state/Texas Department of Parks and Wildlife | State park contains an outstanding example of cave features formed during the phreatic phase of development. | ||||
| 14 | 29.8077°N -99.5707°W | state/Texas Department of Parks and Wildlife | An excellent illustration of Edwards Plateau flora and fauna. | ||||
| 15 | 33.9553°N -102.777°W | federal/US Fish & Wildlife Service | Saline lake beds, and shortgrass grama grasslands characteristic of the high plains. | ||||
| 16 | 31.757°N -102.4791°W | county | Contains two meteorite impact craters. The largest is 550feet in diameter. | ||||
| 17 | 34.9847°N -101.7019°W | state/Texas Department of Parks and Wildlife | Spectacular canyon that is an excellent example of a landform created by running water. | ||||
| 18 | 26.0852°N -98.1345°W | federal/US Fish & Wildlife Service | A living museum of the lowland forested area of the Lower Rio Grande Valley. | ||||
| 19 | 29.6924°N -98.3428°W | private | A multilevel cavern system containing unusual speleothems and intricate helictites. | ||||
| 20 | 29.8792°N -98.6419°W | private | Contains rare and nationally outstanding examples of speleothems. | ||||