* The Edwards Plateau: This region covers the central part of Texas and is characterized by its rolling hills and limestone cliffs. The Edwards Plateau is home to a variety of ecosystems, including grasslands, woodlands, and desert scrub.
* The Llano Uplift: This region covers the central-western part of Texas and is characterized by its rugged terrain and granite outcrops. The Llano Uplift is home to a variety of ecosystems, including forests, grasslands, and desert scrub.
* The Great Plains: This region covers the northern part of Texas and is characterized by its flat, treeless terrain. The Great Plains are home to a variety of ecosystems, including grasslands, prairies, and desert scrub.
* The Rocky Mountains: This region covers the westernmost part of Texas and is characterized by its towering mountains and deep canyons. The Rocky Mountains are home to a variety of ecosystems, including forests, alpine meadows, and desert scrub.