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| Coastal Cordillera (Chile) | |
|---|---|
| Name | Coastal Cordillera (Chile) |
| Other name | Cordillera de la Costa |
| Country | Chile |
| Highest | Cerro La Campana |
| Elevation m | 1881 |
| Length km | 3000 |
Coastal Cordillera (Chile) is the coastal mountain range that runs along much of the Pacific margin of the Republic of Chile from the Arica Region in the north to the Los Lagos Region in the south. It forms a distinct physiographic belt parallel to the Andes and the Pacific Ocean coast, influencing regional Valparaíso, Santiago, Biobío and Los Lagos landscapes and serving as a barrier between coastal basins and interior valleys.
The Coastal Cordillera stretches from the vicinity of Arica and Parinacota near the northern Andes through Antofagasta, Atacama, Coquimbo, Valparaíso, Santiago, O'Higgins, Maule, Ñuble, Biobío and into the Los Ríos and Los Lagos areas. Major coastal ranges and massifs include Cerro Tololo, Cerro La Campana, Nahuelbuta Range, Cordillera Pelada, and the Chiloé foothills. The Cordillera creates distinct hydrological divides feeding rivers such as the Copiapó River, Aconcagua River, Maule River, and Bío Bío River and defines coastal plains like the Arauco Peninsula and the Curanipe littoral.
The Coastal Cordillera is part of the active continental margin where the Nazca Plate subducts beneath the South American Plate along the Peru–Chile Trench and the Andean orogeny complex. Rock units include ancient metamorphic and igneous complexes such as Paleozoic schists and gneisses, Mesozoic plutons linked to the Central Andes magmatism, and Cenozoic volcanic and sedimentary cover in places like Atacama. Tectonic processes responsible for uplift and deformation are related to episodes recorded in the seismic history of Chile, including events associated with the 1960 Valdivia earthquake and the 2010 Chile earthquake. Notable geomorphological features include coastal terraces, marine abrasion platforms, and fault-bounded escarpments connected to structures named in regional studies such as the Central Valley bounding faults.
Climatic regimes across the Cordillera vary from hyperarid conditions influenced by the Humboldt Current and the Atacama Desert in the north to Mediterranean-type climates around Valparaíso, and temperate rainforests in the south near Valdivia. Vegetation ranges from sparse Atacama shrublands and Coastal sage scrub analogues in northern slopes to Chilean Matorral around Santiago and Nothofagus dominated temperate forests in southern sectors including Nahuelbuta. Faunal assemblages include species such as the Guanaco, Huemul, various Phyllotis rodents, and avifauna exemplified by the Andean condor and coastal seabirds tied to the Humboldt Current ecosystem. Biogeographic studies reference provinces like the Chilean Winter Rainfall-Valdivian Forests ecoregion and relate to conservation categories used by World Wildlife Fund assessments.
Human occupation of the Coastal Cordillera spans pre-Columbian cultures including the Aymara, Atacameño, Diaguita, Mapuche, Huilliche, and coastal groups of the Chonos and Chilote seafaring peoples. Archaeological sites relate to broader Andean interaction spheres seen in contexts like Tiwanaku and Inca Empire frontier contacts, and colonial era transformations after encounters with explorers from Spain during the Colonial Chile period. Key historical interactions include the Arauco War between Spanish colonists and Mapuche polities, land tenure changes under the Mapuche conflict and administrative reforms in the Republic of Chile. Missionary activity, ranching, and later mining and forestry altered indigenous territories along corridors linking ports such as Valparaíso and Concepción.
The Coastal Cordillera hosts mining districts producing minerals associated with Mesozoic-Cenozoic intrusions and associated deposits exploited since colonial times around Copiapó and Coquimbo. Forestry operations in southern ranges involve species of Pinus radiata plantations and native monkey puzzle trees linked to industrial complexes serving ports like San Antonio and Talcahuano. Agriculture occupies terraces and valleys adjacent to the Cordillera, including vineyards in the Aconcagua Valley and orchards in the Curicó area. Hydropower capture in rivers draining the Cordillera contributes to the national grid managed by entities such as ENAP-linked utilities, and coastal fisheries associated with Pisco and anchoveta stocks interact with regional economies. Tourism centers include La Campana, archaeological tourism near Monte Verde, and coastal recreation at Viña del Mar.
Protected areas span national parks and reserves such as La Campana National Park, Nahuelbuta National Park, Fray Jorge National Park, Juan Fernández Islands conservation zones linked to Chilean and international designations like World Heritage Sites. Conservation efforts address threats from urbanization in Greater Santiago, invasive species linked to plantation forestry, and habitat fragmentation affecting endemic taxa listed in assessments by the IUCN. Initiatives involve collaboration between institutions such as the CONAF, regional governments like Biobío Region, and international NGOs including Conservation International.
Major settlements and transport corridors run along and across the Cordillera, with urban centers such as Valparaíso, Viña del Mar, Santiago, Concepción, and Valdivia linked by national routes like Pan-American Highway segments, the Ruta 5 and coastal highways. Railway corridors historically connected ports and mining districts, for example lines serving Antofagasta, while modern infrastructure includes international airports at Arturo Merino Benítez International Airport and port facilities at San Antonio and Talcahuano. Engineering works such as tunnels and mountain passes enable connectivity across complex terrain shaped by features like the Cordillera de Nahuelbuta and the coastal escarpment.