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| Yerba Loca Nature Sanctuary | |
|---|---|
| Name | Yerba Loca Nature Sanctuary |
| Alt name | Reserva Natural Yerba Loca |
| Photo caption | Andes foothills near Santiago |
| Location | Santiago Province, Metropolitan Region (Chile), Chile |
| Nearest city | Santiago |
| Area km2 | 7.29 |
| Established | 1973 |
| Governing body | Corporación Nacional Forestal |
Yerba Loca Nature Sanctuary is a protected high-Andean reserve located in the eastern foothills of Santiago in the Metropolitan Region (Chile). The sanctuary conserves glacial valleys, alpine wetlands and native Andean forests within the Andes range and functions as an important peri-urban green space for residents of Greater Santiago. It supports scientific research, outdoor recreation and species protection under the administration of national and municipal institutions.
Yerba Loca sits on the western slope of the Cordillera de los Andes near the Mapocho River basin and borders municipal and provincial jurisdictions including Lo Barnechea and Las Condes. Elevation ranges from montane valleys at roughly 1,500 metres to alpine terrain above 3,000 metres, with glacial cirques and snowfields influenced by the South Pacific High and El Niño–Southern Oscillation. Major hydrological features include tributaries feeding the Maipo River and high-Andean bofedales that affect water supply to Santiago Metropolitan Region. The sanctuary lies within the Mediterranean climate zone of central Chile and is proximate to transportation corridors that connect to Cajón del Maipo and the Portillo (ski resort) access routes.
The area attracted explorers, cartographers and mountaineers in the 19th and 20th centuries, including expeditions associated with the Sociedad de Geografía de Chile and early surveys by officers of the Chilean Army. Conservation interest grew amid urban expansion of Santiago in the mid-20th century; proposals for protected status were advanced by local environmentalists, municipal authorities and the Dirección General de Aguas stakeholders. Formal designation as a nature sanctuary in 1973 involved coordination among the Dirección de Parques y Jardines, Instituto Forestal (INFOR) researchers and the Corporación Nacional Forestal, reflecting broader regional policy trends following the establishment of protected areas like Parque Nacional Torres del Paine and Reserva Nacional Río Clarillo.
The sanctuary preserves remnants of maquis-type sclerophyllous scrub, high-Andean Nothofagus woodlands, and puna-like grasslands that support endemic and relict taxa documented by biologists from Universidad de Chile, Pontificia Universidad Católica de Chile and international teams. Flora records include species associated with Polylepis enclaves, alpine cushion plants studied by the Museo Nacional de Historia Natural (Chile), and threatened taxa listed by the Ministerio del Medio Ambiente (Chile). Fauna inventories note populations of Andean birds such as Diuca and raptors similar to Andean condor sightings, as well as mammals like puma, huemul-related distributions, and small mammals referenced in works by researchers at the Center for Conservation Biology and the International Union for Conservation of Nature monitoring programs. Aquatic invertebrates and high-Andean amphibians have been evaluated in studies affiliated with the Comisión Nacional de Investigación Científica y Tecnológica.
Yerba Loca offers marked routes used by hikers, mountaineers and ski mountaineers who also frequent nearby alpine venues such as Valle Nevado, La Parva, and El Colorado (ski resort). Trails lead to summits, glacial lakes and passes used in classic ascents cataloged by clubs like the Club Andino de Chile and the Alpine Club of Santiago. Popular itineraries connect with the Cajón de Maipo network and provide approaches to peaks referenced in regional guidebooks published by the Sociedad de Geografía de Chile and international publishers. Trail stewardship has involved volunteer groups, municipal outdoor programs and university mountaineering teams.
Management is overseen by the Corporación Nacional Forestal in coordination with municipal bodies and stakeholder coalitions including non-governmental organizations, local communities and academic partners such as Universidad de Santiago de Chile researchers. Conservation priorities address erosion control, invasive species management, wildfire prevention in coordination with the Onemi emergency framework, and watershed protection linked to Dirección General de Aguas mandates. Management plans integrate principles from international accords like the Convention on Biological Diversity and national instruments administered by the Ministerio del Medio Ambiente (Chile), with monitoring programs aligned to protocols used by BirdLife International and regional conservation initiatives.
Visitor services include entrance coordination, interpretive signage, and designated parking areas connecting to shuttle services used by tourists from Santiago International Airport and urban transit hubs. Nearby hospitality and guiding services operate from Santiago and the Cajón del Maipo corridor, with activity providers listed by municipal tourism offices and regional chambers such as the Servicio Nacional de Turismo (SERNATUR). Facilities emphasize low-impact tourism consistent with policies promoted by organizations including the World Wide Fund for Nature and regional sustainable tourism programs. Educational outreach and citizen-science opportunities are offered via partnerships with universities, the Museo de la Memoria y los Derechos Humanos outreach programs, and local conservation NGOs.