Rugged plateaus to wooded mountain slopes. It occupies the extreme western part of the state eastward generally to the Pecos River. This is a region of diverse habitats and vegetation, varying from the desert valleys and plateaus to wooded mountain slopes. Mountain outwash materials haved formed the soils of the Trans Pecos. Surface textures and profile characteristics are varied.
Soil reaction is generally alkaline.
Due to the diversity of soils and elevations, many vegetation types exist in the region. Although most of Texas is located on flat plains or rolling plains, there are substantial mountains in the Trans-Pecos region or far West Texas. The highest point in the state is Guadalupe Peak at 8,749 feet above sea level. Sea level is the lowest elevation in Texas and can be found in all coastal counties. Elevation naturally rises from east to west and south to north.