Region
Texas
3,171
United States
245
New Mexico
147
Oklahoma
78
Edwards Aquifer (Tex.)
73
Houston
73
Mexico
70
Louisiana
67
Mexico, Gulf of
54
San Antonio
48
Tamaulipas (Mexico : State)
43
Hidalgo County (Tex.)
40
Edwards Aquifer
37
Kenedy County (Tex.)
36
Austin
35
El Paso
35
Houston Region
35
Starr County (Tex.)
31
Big Bend National Park
29
Zapata County (Tex.)
29
Bexar County
28
Black Kettle National Grassland (Okla. and Tex.)
28
Cameron County (Tex.)
28
Brooks County (Tex.)
27
Dallas
26
Big Bend National Park (Tex.)
25
Rita Blanca National Grassland (Okla. and Tex.)
25
Big Thicket National Preserve (Tex.)
24
Jim Hogg County (Tex.)
24
Gulf Region
23
Trinity River Watershed
23
Guadalupe Mountains National Park (Tex.)
22
McClellan Creek National Grassland
22
Arkansas
21
Galveston Bay
21
Trinity Aquifer (Tex.)
21
California
19
Chihuahua (Mexico : State)
19
Gulf Coast
19
Hudspeth County (Tex.)
19
Kiowa National Grassland
19
Texas, West
19
Colorado
18
Hudspeth County
18
Southwest, New
18
West (U.S.)
18
Willacy County (Tex.)
18
El Paso County
17
Mexican-American Border Region
17
Waco
17
more ...