Region
Texas
United States
226
New Mexico
144
Oklahoma
77
Houston
73
Edwards Aquifer (Tex.)
69
Mexico
68
Louisiana
65
Mexico, Gulf of
52
San Antonio
48
Edwards Aquifer
37
Austin
35
El Paso
35
Houston Region
35
Big Bend National Park
29
Bexar County
28
Black Kettle National Grassland (Okla. and Tex.)
28
Dallas
26
Rita Blanca National Grassland (Okla. and Tex.)
25
Big Bend National Park (Tex.)
24
Gulf Region
23
Trinity River Watershed
23
McClellan Creek National Grassland
22
Arkansas
21
Galveston Bay
21
California
19
Gulf Coast
19
Kiowa National Grassland
19
Colorado
18
Hudspeth County
18
El Paso County
17
Guadalupe Mountains National Park (Tex.)
17
Waco
17
Balcones Canyonlands National Wildlife Refuge (Tex.)
16
Fort Worth
16
San Antonio Region
16
Trinity Aquifer (Tex.)
16
Coahuila (Mexico : State)
15
Flower Garden Banks National Marine Sanctuary
15
Guadalupe Mountains National Park
15
Mexican-American Border Region
15
Southwest, New
15
Uvalde County
15
West (U.S.)
15
Amistad National Recreation Area
14
Amistad National Recreation Area (Tex.)
14
Balcones Canyonlands National Wildlife Refuge
14
Gillespie County
14
San Antonio River Watershed
14
Arizona
13
more ...