Deep in the Amazon, a massive reserve protects a river basin named for a giant fish.

Countries & Cities · Published 29 September 2026 Swipe more like this →

In short: Spanning over 2.3 million hectares, Jaú National Park is one of South America's largest forest reserves. Located in the state of Amazonas, Brazil, this UNESCO World Heritage Site preserves a unique black water ecosystem, home to jaguars, giant otters, and hundreds of fish species, some of which are new to science.

Established by decree 85.200 on 24 September 1980, Jaú National Park serves as a critical mega-reserve within the Amazon biome. It is situated roughly 220 kilometres northwest of Manaus, encompassing the entire Jaú River basin. The park's name honors the jau, or gilded catfish, one of Brazil's largest freshwater fish. Administered by the Chico Mendes Institute for Biodiversity Conservation, the area is classified as an IUCN category II protected area, designed to balance environmental research, education, and sustainable tourism.

The park's geography is defined by the Negro-Solimões interfluvial plateau, featuring two distinct zones: a higher area with hills reaching 200 metres and a lower region averaging 100 metres in altitude. The landscape is a complex mosaic of dense rainforest, open rainforest, and campinarana vegetation. With an annual rainfall exceeding 2,500 millimetres, the region experiences significant seasonal flooding, creating permanent lakes and poor drainage zones that support a diverse array of specialized plant and animal life.

Biodiversity within the park is immense, with botanists identifying approximately 400 plant species and researchers recording 263 species of fish. Iconic protected fauna include the margay, jaguar, giant otter, and Amazonian manatee. The park's conservation status evolved significantly over time; it was inscribed as a World Heritage Site in 2000 and later became a core component of the Central Amazon Conservation Complex in 2003. It is further integrated into regional initiatives like the Central Amazon Ecological Corridor and the Lower Rio Negro Mosaic, ensuring its protection for future generations.

The park's management is supported by the Amazon Region Protected Areas Program, reflecting its status as a vital ecological anchor. By protecting the entire basin between the Unini and Carabinani rivers, the park maintains the integrity of the black water ecosystem. This preservation effort is essential for maintaining the delicate balance of the Japurá-Solimões-Negro moist forests ecoregion, providing a sanctuary for species that rely on the specific environmental conditions of the Amazonian floodplains.

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