Narrower Terms (16)

• Angelina River Valley (Tex.)
• Brazos River Valley (Tex.)
• Colorado River Valley (Tex.)
• Concho River Valley (Tex.)
• Devils River Valley (Crockett County-Val Verde County, Tex.)
• El Paso Valley (Mexico and Tex.)
• Guadalupe River Valley (Tex.)
• Neches River Valley (Tex.)
• Nueces River Valley (Tex.)
• Paluxy River Valley (Tex.)
• Pecos River Valley (N.M. and Tex.)
• Sabine River Valley (Tex. and La.)
• San Antonio River Valley (Tex.)
• South Sulphur River Valley (Tex.)
• Tennessee Valley (Tex.)
• Washita River Valley (Tex. and Okla.)