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Edwards Plateau
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The Edwards Plateau is a region of west-central Texas which is bounded by the Balcones Fault to the south and east, the Llano Uplift and the Great Plains region to the north, and the Pecos River and Chihuahuan Desert to the west. San Angelo, Austin, San Antonio and Del Rio roughly outline the area.
The bedrock consists primarily of limestone, with elevations ranging between 100 ft. and 3000 ft. Caves and springs (in wet years) are numerous.

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Encyclopedia
The Edwards Plateau is a region of west-central Texas which is bounded by the Balcones Fault to the south and east, the Llano Uplift and the Great Plains region to the north, and the Pecos River and Chihuahuan Desert to the west. San Angelo, Austin, San Antonio and Del Rio roughly outline the area.
The bedrock consists primarily of limestone, with elevations ranging between 100 ft. and 3000 ft. Caves and springs (in wet years) are numerous. The Plateau mostly lacks deep soil suitable for farming, though some cotton, grain sorghum and oats are grown. Thin soil and rough terrain areas are primarily grazing regions, with cattle, sheep and Angora goats predominant. Several rivers cross the region, which generally flow to the south and east through the Texas Hill Country toward the Gulf of Mexico; however, permanent surface water supplies are sparse throughout the area, except for man-made reservoirs. The area is well drained; rainwater flows into the Edwards Aquifer recharge zone at the south of the plateau to feed rivers to the south. Rainfall varies from 15 to 33 in. per year, on average, from northwest to southeast.
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