Texas Physical Geography: Land Regions, Rivers, Lakes & Mountains

Texas spans 268,596 sq mi—larger than France—and its physical geography is remarkably diverse. The state is divided into five major land regions, each with distinct topography, climate, and ecosystems.

Land Regions

• Gulf Coastal Plains – Southeast; low, flat, rich soils, 200 mi inland. Home to Houston, petrochemical hub, wetlands.
• Piney Woods – East Texas; dense pine/hardwood forests, lakes (Toledo Bend, Sam Rayburn), timber industry, recreation.
• Blackland Prairies – Central belt; fertile black clay soils, cotton/corn belt. Includes Austin, Dallas, Waco.
• Edwards Plateau (Hill Country) – Central; limestone hills, canyons, springs, caves. Enchanted Rock, Guadalupe River, wineries.
• Trans-Pecos – Far West; Chihuahuan Desert, mountains, basins. Big Bend, Guadalupe Mountains, El Paso, military bases.

Major Rivers

• Rio Grande – 1,896 mi; TX–Mexico border; vital for irrigation, border communities.
• Colorado River (TX) – 862 mi; flows SE to Matagorda Bay; powers Highland Lakes (Travis, Buchanan), supplies Austin.
• Brazos River – 1,280 mi; longest wholly in TX; feeds agriculture, Possum Kingdom Lake.

Major Lakes

• Lake Travis (Colorado River) – Largest by volume; recreation, water supply for Austin.
• Lake Texoma (Red River) – 2nd largest; TX/OK border; striper fishing, recreation.

Mountains & Canyons

• Guadalupe Peak – 8,751 ft; highest point in TX; Guadalupe Mountains NP.
• Davis Mountains – Volcanic range; McDonald Observatory, Davis Mountains State Park.
• Palo Duro Canyon – 2nd largest canyon in US (120 mi long); "Grand Canyon of Texas"; Panhandle; hiking, camping, musical Texas.

This geographic variety supports Texas's massive agricultural, energy, and tourism economies.