Inscription: 1990-1992

The Abiseo River National Park was established in 1983, located in the territory of the Mariscal Cáceres province, in the northeastern part of the San Martín Region. It is one of the few World Heritage sites inscribed for both cultural and natural values. As a Conservation Unit, its territory comprises two distinct zones: the Restricted Zone and the Buffer Zone. The Restricted Zone consists of the Park itself, covering an area of 274,520 hectares. The Buffer Zone surrounds the former, covering 672,713 hectares. The property includes various types of forests and high Andean grasslands.

The quantity and variety of archaeological sites found indicate human occupation since the preceramic era around 6,000 BC, continuing until before the Spanish colonization. Since 1985, 36 archaeological sites have been recorded, 29 in the high-elevation grasslands and seven in the park's forests. The property protects the headwaters of three rivers in the Huallaga system, an important tributary of the Amazon. The Andean meadows as well as the lowland, mountainous, and cloud forests host a significant number of species, notably the yellow-tailed woolly monkey, one of the largest monkey species in South America.

The pre-Hispanic monuments in the Montecristo valley within the Abiseo River National Park represent outstanding examples of human adaptation, evolution, and settlement in the high-altitude forests of the Peruvian Andean Amazon basin (Criterion (iii)). The Abiseo River National Park encompasses a watershed covered by dense forests. The great beauty of its varied mountainous landscape is complemented by numerous small mountain lakes, pools, rivers, streams, and steep canyons (Criterion (vii)). Across the vast altitudinal gradient from about 350 to 4,349 meters above sea level, influenced by highly variable soils, exposures, rainfall patterns, and microclimates, the property supports very diverse ecosystems and habitats (Criterion (ix)).

More than 5,000 plant species have been recorded, with almost 1,000 species in the grasslands. Taxonomic studies indicate species unknown to science, including vertebrates such as reptiles, amphibians, and even small mammals. Mammalian fauna include the spectacled bear, giant armadillo, northern Andean deer, jaguar, and various other cat species. Hundreds of bird species and countless arthropods are distributed throughout the habitats and ecological niches (Criterion (x)).

Integrity. The Abiseo River National Park contains features ranging from rock shelters to residential, ceremonial, production (platforms and storehouses), cemetery, and road structures that remain intact despite the passage of time, with natural and cultural features important for conservation and research. From the natural heritage perspective, it is notable that the full altitudinal gradient from lowlands to high Andean grasslands enjoys full protection.

Authenticity. The geographic configuration, isolation, and inaccessibility of the area have helped maintain the integrity of the Abiseo River National Park as well as the authenticity of its archaeological remains. No significant human interventions have occurred since its abandonment in the 16th century until its rediscovery in the 19th century. These conditions demonstrate that the diversity of archaeological sites across various altitudes and areas of the Abiseo River National Park testify to the process and historical continuity of human adaptation, evolution, and development.

Protection and management requirements. The lack of infrastructure and difficult access to most of the property have ensured a significant degree of protection against disturbances and illegal activities. In 1983, twenty years after its scientific discovery, the archaeological site of the Gran Pajatén Citadel was designated as National Cultural Heritage. That same year, the Abiseo River National Park was established with the goal of protecting the exceptional cloud forest, the Abiseo watershed, and the cultural values of the area. From the outset, the Ministry of Agriculture (later the Ministry of Environment) and the National Institute of Culture, currently the Ministry of Culture, have shared formal responsibility for management. Despite the evident tourism potential of the landscape and archaeological sites, public visits are restricted due to the fragility of the property.

Trekking