Serra do Divisor National Park

Serra do Divisor National Park is a large protected area in western Brazil that conserves a block of forested mountains and river valleys along the Brazil-Peru border in the state of Acre. It protects rugged ridges, steep escarpments and Amazon rainforest mosaics that are biologically rich and relatively little disturbed.

The park is visited mainly by researchers and small numbers of tourists on organised expeditions; highlights include river-based travel, rainforest wildlife, and scenic viewpoints over steep forested hills. There are no large roads through the park and access typically requires multi-day boat journeys or small aircraft to riverine bases.

The protected area was created to conserve the distinctive Serra do Divisor massif and its associated rivers and forests, maintaining ecological connectivity across the border with Peru. Its combination of lowland Amazonian forest and abrupt rocky ridges sets it apart from the surrounding flat floodplain.

The park sits in extreme western Acre along the frontier with Peru, drained by tributaries of larger Amazon basin rivers. The nearest regional hubs that serve as entry points are river towns in Acre, with Cruzeiro do Sul commonly used to reach staging points for expeditions.

• Access: The park is remote and most visits are arranged from the town of Cruzeiro do Sul in Acre, commonly involving multi-day river travel or small-aircraft transfers to forest bases.
• Biodiversity: The area is notable for high levels of Amazonian biodiversity and a mix of lowland rainforest, steep tepui-like ridges and river valleys that create distinct habitats for endemic species.

What to See #

• Serra do Divisor massif: The central massif of folded ridges and escarpments that gives the park its name, characterised by steep slopes, cliffs and rainforest cover; this core area contains many of the park's endemic species and rugged terrain.