There Is No "North Texas Coastal Plains" Region

The premise is incorrect: Texas does not have a "North Texas Coastal Plains" region.

Actual Texas Coastal Plains

The Gulf Coastal Plains extend across southern and southeastern Texas—from the Sabine River (LA border) to the Rio Grande—covering the Houston, Corpus Christi, and Brownsville areas. They are characterized by:

• Low elevation (<150 m)
• Sedimentary soils
• Humid subtropical climate
• Marshes, prairies, oak mottes

North Texas Is Different

"North Texas" typically means the Dallas-Fort Worth Metroplex and surrounding counties. This area lies in the Grand Prairie and Cross Timbers ecoregions—rolling plains, limestone cuestas, post oak savannas. It is inland, 250+ miles from the Gulf.

Why the Confusion?

• Misapplication of "coastal" to any low-lying area.
• Conflation with "North Central Texas" (a valid planning region).
• Some maps lump broad "Coastal Plain" provinces that extend northward geologically, but not as a recognized geographic region.

If you're studying Texas regions, use the standard physiographic provinces: Gulf Coastal Plains, Central Lowlands, Great Plains, Basin & Range.