Serra do Divisor National ParkAbout 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.
Best Time to Visit Serra do Divisor National Park
May-September is generally the most practical period for terrestrial exploration; high-water season enables deeper river travel but increases logistical complexity.
Weather & Climate near Serra do Divisor National Park
Serra do Divisor National Park's climate is classified as Tropical Rainforest - Tropical Rainforest climate with consistently warm temperatures year-round. Temperatures range from 19°C to 32°C. Abundant rainfall (1943 mm/year), wettest in March.
| Month | Comfort | Temp | Feels | Rain | Sky | Humidity | Wind | UV | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | Acceptable | 21° - 30° | 26° | 222 mm | overcast | 90% | 0.9 m/s | 2.0 very high | 12.4h |
| February | Acceptable | 21° - 30° | 26° | 231 mm | overcast | 91% | 0.8 m/s | 1.9 very high | 12.3h |
| March | Acceptable | 21° - 30° | 26° | 270 mm | overcast | 92% | 0.7 m/s | 1.9 very high | 12.0h |
| April | Acceptable | 21° - 30° | 26° | 208 mm | overcast | 91% | 0.6 m/s | 1.9 very high | 11.8h |
| May | Very Good | 20° - 30° | 25° | 131 mm | partly cloudy | 88% | 0.7 m/s | 1.7 very high | 11.6h |
| June | Excellent | 19° - 30° | 25° | 73 mm | partly cloudy | 84% | 0.6 m/s | 1.6 very high | 11.5h |
| July | Excellent | 19° - 30° | 24° | 41 mm | partly cloudy | 75% | 0.7 m/s | 1.7 very high | 11.6h |
| August | Excellent | 19° - 31° | 25° | 63 mm | some cloud | 66% | 0.7 m/s | 1.8 very high | 11.7h |
| September | Very Good | 20° - 32° | 26° | 101 mm | partly cloudy | 68% | 0.8 m/s | 1.8 very high | 11.9h |
| October | Good | 21° - 31° | 26° | 168 mm | overcast | 74% | 0.8 m/s | 2.0 extreme | 12.2h |
| November | Good | 21° - 31° | 26° | 212 mm | overcast | 82% | 0.9 m/s | 2.0 very high | 12.4h |
| December | Acceptable | 21° - 31° | 26° | 223 mm | overcast | 88% | 1.0 m/s | 1.9 very high | 12.5h |
How to Get to Serra do Divisor National Park
Access is primarily by river from border towns in Acre and by small aircraft to regional airstrips; the park’s remoteness means most travelers join organized expeditions from Rio Branco or Cruzeiro do Sul. Local guides and park authorization are required for most visits.
Tips for Visiting Serra do Divisor National Park
- Arrange access and guides through the Brazilian park service (ICMBio) or an authorized local operator - much of the park is remote and requires local knowledge.
- Bring insect protection and treatment for leishmaniasis prevention when advised; the Amazon edge has its seasonal biting insects.
- Travel between May and September for lower river levels ideal for jungle trails; high-water season (November-April) is better for canoe travel but can flood trails.