Region
Texas
United States
211
New Mexico
130
Houston
65
Mexico
65
Oklahoma
61
Louisiana
58
Edwards Aquifer (Tex.)
56
Mexico, Gulf of
51
San Antonio
46
El Paso
34
Austin
31
Edwards Aquifer
30
Bexar County
25
Big Bend National Park
25
Black Kettle National Grassland (Okla. and Tex.)
25
Rita Blanca National Grassland (Okla. and Tex.)
25
Big Bend National Park (Tex.)
22
Dallas
22
Gulf Region
22
Galveston Bay
21
Trinity River Watershed
21
California
19
Kiowa National Grassland
19
McClellan Creek National Grassland
19
Colorado
18
Gulf Coast
18
Arkansas
17
El Paso County
16
Fort Worth
16
Guadalupe Mountains National Park (Tex.)
15
Houston Region
15
San Antonio Region
15
Southwest, New
15
Waco
15
Guadalupe Mountains National Park
14
Mexican-American Border Region
14
San Antonio River Watershed
14
West (U.S.)
14
Montana
13
Rio Grande (Colo.-Mexico and Tex.)
13
Uvalde County
13
Arizona
12
Balcones Canyonlands National Wildlife Refuge
12
Balcones Canyonlands National Wildlife Refuge (Tex.)
12
Big Thicket National Preserve (Tex.)
12
Alaska
11
Brazos River Watershed
11
Corpus Christi
11
El Paso Region
11
more ...