What are some geographic subsections of the mountains and basins Texas?

- It includes the eastern parts of the Edwards Plateau and the Cross Timbers and a relatively small area of the rolling plains and Blackland Prairie.

Central

- This subsection lies immediately west of the Edwards Plateau. It includes the western part of the Edwards Plateau and the Stockton Plateau, the Llano Uplift, and the Pedernales Hills.

Trans-Pecos

- This subsection includes all Texas that lies west of the Pecos River. Much of this area is within the Basin and Range Province, but the Southern Rocky Mountains extend across the southwestern corner of the state, and several areas of volcanic hills exist.