A natural landmark, this chain of sand dunes extends for 130 miles and is three to five miles wide. Archeological findings show that the area was inhabited 6,000 years ago. Comanches camped in the sand hills because of wild game, vegetation, protection from the wind, and the availability of water. Spanish explorers and later Anglo-Americans used the old Indian trails that passed along the dunes. Early ranching did little damage to the area. However, in recent years, the sand hills have been destroyed by extensive farming and industrial operations. (1979)