Level IV Ecoregions in the Cross Timbers

• 27i – Broken Red Plains
• 29b – Eastern Cross Timbers
• 29c – Western Cross Timbers
• 29d – Grand Prairie
• 29e – Limestone Cut Plains
• 29f – Carbonate Cross Timbers
• 30a – Edwards Plateau
• 30b – Llano Uplift
• 32a – Northern Blackland Prairie
• 32c – Flood Plains and Low Terraces