The Andes to the east and the Coastal Range to the west create a long, narrow corridor, forcing the city to grow north and south rather than outward. This Mediterranean climate—characterized by dry summers and wet winters—is a direct result of the rain shadow cast by the Andes.
Santiago Chile Geography Historical Urban Development
This valley floor, composed of fertile sediment deposited by ancient rivers, provides the essential flat land for agriculture and, subsequently, for one of South America's largest metropolitan areas. Summers are long, hot, and dry, with temperatures often exceeding 30°C, while winters are cold but rarely freezing, with frequent morning fog trapped in the basin.
Conversely, the western boundary is more gradual, allowing the city to expand into the flatlands of the Central Valley. The mountains block the moist air from the Pacific Ocean, forcing it to rise, cool, and dump its precipitation on the western slopes.
Santiago Chile Geography Historical Urban Development
This topographical constraint has led to a metropolitan area that is extensive rather than dense, with distinct districts like Providencia, Vitacura, and Las Condes spreading across the valley floor. The surrounding Andes are not merely a view; they are an active geological force shaping the environment.
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