| Term | Definition |
| Coastal Plains | a broad strip of low, flat land that stretches along the Gulf of Texas |
| Coastal Plains | Texas' largest natural region |
| North Central Plains | a flat, ROLLING region that extends from Texas through parts of Canada, ideal place for farming |
| Great Plains | Flatlands that rise gradually from east to west; Land eroded by wind and water; Low rainfall; Dust storms |
| Mountains and Basins | Highest and driest of the 4 Regions, mostly desert area, part of the Rocky Mountain System |
| Mountains and Basins | Farming is done here along the Rio Grande for irrigation |
| Coastal Plains | 2 out of 3 Texans live and work here |
| Coastal Plains | Pine Forests- lumber can be found in this region |
| Great Plains | Once home to huge herds of buffalo and Plains Indians |
| Great Plains | Lubbock is found in this region and is a rich cotton production- irrigation |
| North Central Plains | Decent rainfall allows crops- cotton, grains, peanuts, watermelons etc, decent for ranching |
| Piney Woods | This sub-region contains many pine trees |
| Post Oak Belt | This sub-region contains many oak trees |
| Blackland Prairie | This subregion contains many of the major cities of Texas |
| Cross Timbers | Contains a variety of trees, but is mostly known for agriculture |
| Grand Prairie | Agriculture is the most important economy in this area |
| Rolling Plains | Large cattle ranches sprawl across this area of Texas |
| High Plains | Cotton, cattle and oil are all important industries here. |
| Llano Basins | Elevations are lower here due to erosion, contains several large lakes on the Colorado river |
| Edwards Plateau | Ill-suited for farming, economy depends largely on cattle, goat and sheep raising |
| Mountains and Basins | All of Texas' true mountains are located here |