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| Islas Desventuradas | |
|---|---|
| Name | Islas Desventuradas |
| Location | South Pacific Ocean |
| Major islands | San Félix, San Ambrosio |
| Area km2 | 5.5 |
| Highest mount | Cerro de los Leones |
| Elevation m | 376 |
| Country | Chile |
| Population | 0 (permanent) |
Islas Desventuradas are a small, remote group of islands in the southeastern Pacific Ocean under Chilean sovereignty. The archipelago lies west of Valparaíso Region and is notable for its isolation, limited human presence, and role in marine and avian conservation. The islands have been the subject of scientific expeditions from institutions such as the Charles Darwin Foundation, Smithsonian Institution, and Royal Society-affiliated researchers.
The archipelago comprises four main islets—San Félix, San Ambrosio, and two smaller rocks—located about 850 km west of Valparaíso and roughly 670 km north of Juan Fernández Islands. Navigation charts from the United Kingdom Hydrographic Office and the Instituto Hidrográfico de la Armada de Chile mark hazardous reefs and deep surrounding bathymetry connected to the Nazca Plate margin. Proximity to shipping lanes linking Panama Canal transits and ports like Callao and Pisco has made the area of interest to agencies including the International Maritime Organization and the International Hydrographic Organization. The islands form part of a biogeographic corridor between the Juan Fernández Islands and the Desert of Atacama coastal zone described in works by the International Union for Conservation of Nature and the World Wildlife Fund.
The Desventuradas arise from volcanic construction related to the eastward subduction of the Nazca Plate beneath the South American Plate. Geologic mapping by teams associated with the United States Geological Survey and the Servicio Nacional de Geología y Minería documents basaltic to andesitic lithologies and submarine volcanic edifices similar to those studied at Easter Island and along the Easter Microplate. Petrologic comparisons invoke datasets from the Ocean Drilling Program and geochemical reference to samples archived at the Smithsonian Institution National Museum of Natural History. The region is seismically active as recorded by networks like the Pacific Tsunami Warning Center and the Centro Sismológico Nacional, with tectonic history tied to events such as the 1960 Valdivia earthquake and ongoing studies by the International Association of Seismology and Physics of the Earth's Interior.
The islands experience a temperate maritime climate modulated by the Humboldt Current and atmospheric patterns influenced by the El Niño–Southern Oscillation and Southern Annular Mode. Meteorological observations compared with data from Easter Island and Rapa Nui illustrate low annual precipitation, strong winds, and sea-surface temperature regimes monitored by the National Oceanic and Atmospheric Administration and the European Centre for Medium-Range Weather Forecasts. Ecosystems include arid shrublands, sparsely vegetated basaltic slopes, and rich pelagic waters supporting trophic webs described in reports from the Food and Agriculture Organization and studies by the Scripps Institution of Oceanography. The surrounding marine ecoregion links to migratory pathways used by species tracked by the Global Ocean Observing System and tagging programs from the Monterey Bay Aquarium Research Institute.
European contact records reference sightings by Spanish navigators associated with expeditions from Viceroyalty of Peru maritime operations and later charting by British hydrographers connected to James Cook-era voyages and the Hydrographic Office. Sovereignty assertions and visits involved Chilean naval expeditions from the Armada de Chile and scientific voyages by institutions such as the University of Chile and the Pontifical Catholic University of Chile. Research campaigns have included scientists from Chile's National Museum of Natural History, the Pontifical Catholic University of Valparaíso, and international teams from the University of California, Santa Cruz. Occasional temporary stations and logistical support have been provided from bases like Punta Arenas and Valparaíso Naval Station, with programming coordinated alongside the Ministry of Foreign Affairs (Chile) and the Ministry of National Assets (Chile).
The archipelago is a critical breeding site for seabirds such as species with affinities to taxa studied by ornithologists at the British Ornithologists' Union, Cornell Lab of Ornithology, and the American Ornithological Society. Notable faunal connections are drawn to populations recognized in conservation lists by the IUCN Red List and managed under frameworks similar to the Convention on Biological Diversity and the Agreement on the Conservation of Albatrosses and Petrels. Marine biodiversity includes kelp and fish assemblages comparable to those cataloged by the Intergovernmental Oceanographic Commission and the International Council for the Exploration of the Sea. Conservation measures have been advocated by organizations including Conservación Marina, Wildlife Conservation Society, and national agencies such as the Servicio Nacional de Pesca y Acuicultura. Research papers published in journals like Nature, Science, and Marine Ecology Progress Series cite the islands as reference sites for endemism, invasive species control, and marine protected area design implemented in line with Convention on International Trade in Endangered Species considerations.
Administratively, the islands are part of the Valparaíso Region and fall under national jurisdiction established by laws administered through the Presidency of Chile and ministries including the Ministry of National Assets (Chile) and the Ministry of Defense (Chile). Chilean statutes and decrees relating to insular territories mirror instruments handled by the National Congress of Chile and have been subject to analysis in legal scholarship from the Universidad de Chile Faculty of Law and international law experts at institutions like the Hague Academy of International Law. Maritime zones and exclusive economic zone claims around the islands are governed by principles from the United Nations Convention on the Law of the Sea and have been referenced in submissions to the Commission on the Limits of the Continental Shelf and dialogues involving the International Tribunal for the Law of the Sea.