Desengano State Park

Desengano State Park protects a stretch of rugged mountains and Atlantic Forest in the Northern Fluminense region of Rio de Janeiro state, Brazil. Established in 1970, it became the first International Dark Sky Park in Brazil and all of Latin America when it earned the designation in 2023.

Why Desengano State Park is a top stargazing spot

The park's mountain valleys and dense forest naturally isolate it from the light of nearby towns, and its average sky quality reading of 21.75 magnitudes per square arcsecond confirms just how dark those skies really are. As part of its certification effort, the park upgraded 78 lighting fixtures to fully shielded, warm 2300K amber lamps, removed three unnecessary fixtures near the visitor centre, and even used recycled materials for the new light coverings, work that helped secure its landmark Dark Sky Park status.

What you can see

On a clear night at Desengano, around 3,000 stars are visible to the naked eye across the year, an extraordinary number by any standard and a world away from what most city dwellers ever see. The Milky Way is described as clearly visible and striking here, arcing over the Atlantic Forest canopy with none of the artificial lighting that would otherwise wash it out.

Visiting Desengano State Park at night

The Morumbeca dos Marreiros sector is the park's best-equipped area for visitors, with motorized vehicle access and visitor infrastructure that make it the practical starting point for a stargazing trip. Much of the wider park has a total absence of artificial lighting, so bring your own red-light torch and check current visiting hours and any guided-night details with park management (INEA) before you go.

Best time to go

Being in the southern hemisphere, Desengano's clearest, driest skies fall in the May to August window, which the park itself highlights as the best stargazing months. This period also favours winter views of the Milky Way's outer regions and southern constellations. Wherever possible, time your visit to the new Moon, allow 20 to 30 minutes for your eyes to fully dark-adapt, and stick to red light once you are out under the stars.

Getting there

Desengano State Park lies in the Northern Fluminense region of Rio de Janeiro state, its mountainous terrain forming a natural buffer from the light pollution of the state's larger coastal cities. The Morumbeca dos Marreiros entrance is the recommended access point for visitors arriving by vehicle.

See your named star from here

With roughly 3,000 stars visible to the naked eye, Desengano is an outstanding place to try to pick out a named star using its coordinates and a stargazing app. Explore the star catalogue to name one before your trip, and check out other observatories and dark-sky sites to plan your next dark-sky adventure.