Valley vs Presidio

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A valley is an elongated low area often running between hills or mountains which will typically contain a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers or streams over a very long period of time. Some valleys are formed through erosion by glacial ice. These glaciers may remain present in valleys in high mountain or polar areas. At lower latitudes and latitudes, these glacially-formed valleys may have been created or enlarged during ice ages but now be ice-free and occupied by streams or rivers.

In desert areas, valleys may be entirely dry or carry a watercourse only rarely. In areas of limestone bedrock, dry valleys may also result from drainage taking place underground rather than at the surface. Rift valleys arise principally from earth movements, rather than erosion. Many different types of valley are described by geographers, using terms that may be global in use or else applied only locally.

Source: Wikipedia

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A presidio (from the Spanish, presidio, meaning "jail" or "fortification") is a fortified base established by the Spanish in areas under their control or influence. The term is derived from the Latin word praesidium meaning protection or defense. In the Mediterranean and the Philippines, the presidios were outposts of Christian defense against Islamic raids. In the Americas, the fortresses were built to protect against pirates and rival colonists, as well as against resistance from Native Americans. The presidios of Spanish-Philippines in particular, were centers where the martial art of Arnis de Mano was developed, combining Filipino, Latin-American and Spanish fighting techniques.

Later in western North America, with independence, the Mexicans garrisoned the Spanish presidios on the northern frontier and followed the same pattern in unsettled frontier regions such as the Presidio de Sonoma, at Sonoma, California, and the Presidio de Calabasas, in Arizona. In western North America, a rancho del rey or king's ranch would be established a short distance outside a presidio. This was a tract of land assigned to the presidio to furnish pasturage to the horses and other beasts of burden of the garrison. Mexico called this facility "rancho nacional". Presidios were only accessible to Spanish military and soldiers.

Source: Wikipedia