Local vegetation also varies from north to south with the lower third consisting of the temperate grassland extending from South Texas to South Louisiana.
The upper two-thirds of the region dominated by temperate forest known as the Piney Woods, which extends over 23,500 square miles (61,000 km).
The East Texas Regions includes Tyler, Longview, Marshall, Palestine, Jacksonville, Mount Pleasant, and Nacogdoches.
Most of the region consists of the Piney Woods ecoregion, and East Texas can sometimes be reduced to include only the Piney Woods.
Cypress Bayou surrounds the Big, Little, and Black Cypress rivers around Jefferson.
Other religions with smaller numbers, but with adherents in East Texas, include Mormonism and Judaism.The Brazos cuts through the southwest portion of the region while the Red River forms its northern border with Oklahoma and a portion of Arkansas.In East Texas and the rest of the South, small rivers and creeks collect into swamps called "Bayous" and merge with the surrounding forest.In Houston the average January temperature is 50.4 °F (10.2 °C) and the average July temperature is 82.6 °F (28.1 °C), however Houston has slightly warmer winters than most of East Texas due to its proximity to the coast.All of East Texas also lies within the Gulf Coastal Plain, but with less uniformity than the climate with rolling hills in the north and flat coastal plains in the south.