Campo de los Alisos

Campo de los Alisos National Park (now the Campo de los Alisos portal of Parque Nacional Aconquija since 2018) originally protected 17,000 hectares in Tucumán province, Argentina, encompassing high-altitude grasslands, yungas cloud forests, and mountain landscapes in the southern yungas ecoregion. ^[1] Established by Law 24,526 in 1995, the park protects an important transition zone where Andean high-altitude environments meet subtropical yungas forests, with terrain ranging from 800 to over 5,000 meters above sea level. The park serves as critical habitat for endangered species and protects water sources for surrounding regions. Its most significant archaeological feature is La Ciudacita, an Inca ceremonial site at approximately 4,400 meters recognized as part of the Qhapaq Ñan UNESCO World Heritage Site. ^[2]

Campo de los Alisos hosts a diverse array of wildlife adapted to its varied elevations and ecosystems. Large mammals include the endangered Andean cat (Leopardus jacobita), puma (Puma concolor), and Andean fox (Lycalopex culpaeus). The park also hosts significant bird populations, including the Andean condor (Vultur gryphus) and various species of hawks and eagles. The Tucumán parrot (Amazona tucumana), a threatened endemic species, inhabits the yungas forest. ^[1] Notable amphibians and reptiles include several endemic species of toads and lizards adapted to high-altitude environments.

The park's vegetation varies significantly with altitude, creating distinct ecological zones. The lower elevations feature subtropical yungas forest with tree species like the Andean alder (Alnus acuminata) and various laurels. Mid-elevations support mountain forest and grasslands, while the higher regions contain high-altitude meadows known as pastizales de altura. Notable plant species include queñoa trees (Polylepis australis), which grow at exceptionally high elevations in South America, and various endemic orchid species. ^[1] The park also harbors important medicinal plants used traditionally by local communities.

The park's geology is characterized by the eastern slopes of the Aconquija Mountains, part of the Andes mountain system in northwestern Argentina. The terrain features dramatic elevation changes, ranging from around 800 to over 5,000 meters above sea level, creating diverse geological zones. The landscape was shaped by intense tectonic activity and glacial processes, resulting in deep valleys, steep mountain slopes, and numerous water courses. The bedrock consists primarily of metamorphic and igneous rocks, with significant deposits of granite and schist.

Campo de los Alisos National Park experiences a subtropical highland climate with distinct seasonal variations. Summers (December to February) are warm and wet, with temperatures ranging from 20-30°C (68-86°F) and frequent afternoon thunderstorms. Winters (June to August) are cool and dry, with temperatures between 5-15°C (41-59°F) and occasional frost at higher elevations. The park receives most of its annual rainfall during the summer months, creating lush vegetation conditions. Spring and autumn are transitional seasons with moderate temperatures and variable precipitation.

The park was established in 1995 to protect the unique ecological and archaeological heritage of the region. The area has significant historical importance as it contains remnants of Inca settlements and trails, including sections of the Qhapaq Ñan (Inca Road System). The most notable site is La Ciudacita (also called Pueblo Viejo), situated at approximately 4,400 meters elevation, representing some of the southernmost Inca constructions. As part of the Qhapaq Ñan network, La Ciudacita is designated UNESCO World Heritage. ^[1] Archaeological evidence suggests human occupation dating back several centuries. The park's name Campo de los Alisos comes from the abundance of Andean alder trees (alisos) that dominate parts of the landscape.

The Campo de los Alisos area was first established as a national park by Law 24,526 on August 9, 1995, protecting an initial 10,661 hectares. ^[1] A 2014 expansion brought the protected area to approximately 17,000 hectares. In 2018, by Law 27,451, Campo de los Alisos was incorporated into the newly created Parque Nacional Aconquija, which encompasses the area as one of its portals. ^[2] The park protects representative yungas ecosystems and provides habitat for endangered species. Management addresses ongoing challenges including illegal grazing, hunting pressures, and invasive species.

The park's most remarkable features include well-preserved sections of the Inca Trail (Qhapaq Ñan), which offers visitors insights into ancient transportation networks. The imposing Nevados del Aconquija, reaching over 5,000 meters, provide spectacular views and challenging climbing opportunities. The park contains numerous waterfalls, crystal-clear mountain streams, and glacial lakes. The centerpiece archaeological site is La Ciudacita, an Inca ceremonial site at approximately 4,400 meters, accessible via a challenging multi-day trek with authorized guides. ^[1] The diversity of ecosystems makes it an excellent location for ecological research and nature observation.

Access to Campo de los Alisos (now the Campo de los Alisos portal of Parque Nacional Aconquija) is via San Miguel de Tucumán, with park entrances reached through mountain roads requiring high-clearance vehicles. A ranger station provides basic information and orientation. Facilities are minimal, with primitive camping areas and trail access points. Several hiking routes traverse different vegetation zones from cloud forests to grasslands. The park offers opportunities for birdwatching, wildlife observation, and exploring yungas ecosystems. Trails vary in difficulty, with some requiring good physical condition due to elevation and terrain. The nearby town of Tafí del Valle provides accommodations and basic services. The park is accessible year-round, though the rainy summer season (November-March) can make access roads and trails muddy and challenging.

Campo de los Alisos protects important yungas cloud forest ecosystems threatened throughout their range. The park provides habitat for endangered species including the taruca (Andean deer), Andean cat, and Tucumán parrot (Amazona tucumana). ^[1] Birdlife includes numerous yungas specialists and endemic species. Forest conservation addresses threats from illegal logging and encroachment. High-altitude grassland protection manages legacy grazing impacts while preventing further degradation. Water source protection ensures clean water for downstream communities and protects the headwaters feeding the Tucumán valleys. The park serves as a biodiversity corridor connecting with other protected areas. Research programs study yungas ecology, threatened species status, and restoration techniques for degraded areas.