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From List of National Natural Landmarks, these are the National Natural Landmarks in Texas. There are 20 in total.

List of National Natural Landmarks in Texas is located in Texas
Attwater Prairie Chicken
Catfish Creek
Cave Without a Name
Caverns of Sonora
Devil's Sinkhole
Dinosaur Valley State Park
Enchanted Rock
Granite Mountain (Texas)
Longhorn Cavern
Lost Maples
Muleshoe National Wildlife Refuge
Natural Bridge Caverns
Odessa Meteor Crater
Palo Duro Canyon
Santa Ana National Wildlife Refuge
High Plains Natural Area
Texas National Natural Landmarks (clickable map)
Name Image Date Location County Ownership Description
1 Attwater Prairie Chicken Preserve 1968 29°40′08″N 96°16′00″W / 29.668827°N 96.266751°W / 29.668827; -96.266751 (Attwater Prairie Chicken Preserve) Colorado federal/US Fish & Wildlife Service Contains the only significant segment of gulf coastal prairie.
2 Bayside Resaca Area 1980 26°13′45″N 97°20′50″W / 26.229081°N 97.347231°W / 26.229081; -97.347231 (Bayside Resaca Area) 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″N 95°54′09″W / 31.90750°N 95.90250°W / 31.90750; -95.90250 (Catfish Creek) 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″N 100°48′44″W / 30.55500°N 100.81222°W / 30.55500; -100.81222 (Caverns of Sonora) Sutton private Contains unusual formations, such as bladed helictites and coralloid growths
5 Devil's Sinkhole 1972 30°00′57″N 100°12′31″W / 30.015773°N 100.208552°W / 30.015773; -100.208552 (Devil's Sinkhole) Edwards state/Texas Department of Parks and Wildlife A deep, bell-shaped, collapsed limestone sink.
6 Dinosaur Valley State Park Dinosaur Valley State Park 1968 32°14′46″N 97°48′48″W / 32.246194°N 97.813375°W / 32.246194; -97.813375 (Dinosaur Valley State Park) 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 Enchanted Rock 1971 30°29′46″N 98°49′12″W / 30.496033°N 98.819952°W / 30.496033; -98.819952 (Enchanted Rock) 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″N 97°28′38″W / 32.843450°N 97.477225°W / 32.843450; -97.477225 (Fort Worth Nature Center and Refuge) 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 Buffalo Lake NWR 1980 34°55′10″N 102°06′40″W / 34.919517°N 102.111118°W / 34.919517; -102.111118 (High Plains Natural Area) 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 Longhorn Cavern 1971 30°41′04″N 98°21′03″W / 30.684441°N 98.350970°W / 30.684441; -98.350970 (Longhorn Cavern) 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 Lost Maples State Natural Area 1980 29°48′28″N 99°34′15″W / 29.807719°N 99.570697°W / 29.807719; -99.570697 (Lost Maples State Natural Area) Bandera, Real state/Texas Department of Parks and Wildlife An excellent illustration of Edwards Plateau flora and fauna.
15 Muleshoe National Wildlife Refuge Sandhill cranes at Muleshoe NWR 1980 33°57′19″N 102°46′37″W / 33.955295°N 102.776973°W / 33.955295; -102.776973 (Muleshoe National Wildlife Refuge) Bailey federal/US Fish & Wildlife Service Saline lake beds, and shortgrass grama grasslands characteristic of the high plains.
16 Odessa Meteor Crater Odessa Meteor Crater 1965 31°45′25″N 102°28′45″W / 31.756998°N 102.479125°W / 31.756998; -102.479125 (Odessa Meteor Crater) Ector county Contains two meteorite impact craters. The largest is 550 feet (170 m) in diameter.
17 Palo Duro Canyon State Park Lighthouse formation 1976 34°59′05″N 101°42′07″W / 34.984709°N 101.701867°W / 34.984709; -101.701867 (Palo Duro Canyon State Park) 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 Wildlife at Santa Anna 1966 26°05′07″N 98°08′04″W / 26.08522°N 98.13448°W / 26.08522; -98.13448 (Santa Ana National Wildlife Refuge) Hidalgo federal/US Fish & Wildlife Service A living museum of the lowland forested area of the Lower Rio Grande Valley.
19 Natural Bridge Caverns Natural Bridge Caverns 1971 29°41′32″N 98°20′34″W / 29.692351°N 98.342760°W / 29.692351; -98.342760 (Natural Bridge Caverns) Comal private A multilevel cavern system containing unusual speleothems and intricate helictites.
20 Cave Without a Name Cave Without a Name speleothems 2009 29°52′45″N 98°38′31″W / 29.8791769°N 98.6419260°W / 29.8791769; -98.6419260 (Cave Without a Name) Kendall private Contains rare and nationally outstanding examples of speleothems.
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