The Réserve Naturelle du Trésor, situated in the commune of Roura approximately 50 kilometres south of Cayenne along the D5 highway, is one of the most accessible primary rainforest nature reserves in French Guiana and a reliable destination for wildlife observation and moderate jungle hiking. The reserve protects a continuous tract of undisturbed lowland Amazonian forest on the eastern flanks of the Kaw Mountain range, harbouring a rich assemblage of endemic birds, amphibians, reptiles, and large mammals in habitat that remains largely intact. From Cayenne, the drive south along the D5 takes approximately one hour by car; car rental is required as no public transport serves the reserve directly. Departing by 07:00 allows arrival during the peak wildlife activity hours of the early morning cool. The reserve's primary marked trail leads through primary forest to the Saut Morin, a series of rocky river cascades set within dense jungle. The round-trip takes approximately two hours at a comfortable walking pace; birdwatchers who stop frequently may take three to four hours. The trail is maintained with occasional waymarkers, but hikers should stay on the marked path as the surrounding terrain is dense and unmarked routes lead quickly into remote wilderness. Birdwatching at the Réserve du Trésor is exceptional: scarlet macaws, toucans, multiple tanager species, and the Guiana cock-of-the-rock have all been recorded in the reserve. Dawn hours between 06:30 and 09:00 consistently produce the highest species counts. A local naturalist guide, arrangeable through operators in Roura, significantly improves mammal and bird sighting rates and provides valuable ecological context. The trailhead has a parking area and information boards but no food or drink facilities. Visitors should bring at least two litres of water per person and a packed lunch, as no services exist within the reserve. Long-sleeved shirts and effective insect repellent are essential. After completing the trail, the town of Roura a few kilometres north on the D5 offers small Creole restaurants for lunch before the return to Cayenne. The reserve sits naturally on the D5 route, making it an easy addition to a Cacao Sunday market visit or a standalone morning excursion.
How to get there
- Car rental from Cayenne (~€30/day); route is all paved
Location
Réserve Naturelle du Trésor, Route D5, 97311 Roura, French Guiana
4.6006, -52.3578 View on map
Highlights
- Saut Morin river cascades deep within undisturbed primary Amazonian rainforest
- World-class birdwatching: scarlet macaws, toucans, and the Guiana cock-of-the-rock recorded regularly
- Well-marked two-hour trail through primary lowland forest with excellent wildlife encounter potential
- Swimming in clear jungle river pools at the cascade base when water levels permit
- Natural D5 pairing with the Cacao Hmong Sunday market for a full culture-and-nature day
Tips for visiting
- Depart Cayenne by 07:00 to arrive during peak wildlife activity in the cool early morning hours
- Bring at least two litres of water per person — no food or drink is available inside the reserve
- Insect repellent and long-sleeved clothing are essential; mosquitoes and biting flies are active throughout the day
- A local naturalist guide from Roura can be pre-arranged and significantly improves wildlife sighting rates
- Combine with the Cacao Sunday market on the D5 on the same day for a full culture-and-nature excursion with minimal extra driving
When to visit
The dry season from August to November offers the most reliable trail conditions and clearest river pools at the cascades. Arriving at dawn (07:00–09:00) maximises wildlife encounters, particularly for birdwatching.
Accessibility
The trailhead parking area is accessible by car. The main forest trail to Saut Morin is unpaved, with tree roots, rocks, and uneven terrain throughout — it is not suitable for wheelchairs or mobility aids. Visitors with limited mobility can appreciate the trailhead area and the sounds of the forest without completing the full trail.
Frequently asked questions
Is a permit or entry fee required to visit the Réserve du Trésor?
Entry to the reserve's main walking trail is free and no advance permit is required. A trailhead visitor register is typically available for sign-in.
How long does the trail to Saut Morin take?
The round-trip to the Saut Morin cascades takes approximately two hours at a moderate walking pace. Birdwatchers making frequent stops may take three to four hours.
Are local guides available for the reserve?
Local naturalist guides can be arranged through operators based in Roura. A guide significantly improves bird and mammal sighting rates and ensures safe navigation within the forest.
Is swimming possible at the Saut Morin cascades?
Swimming in the river pool below the cascades is possible when water levels are moderate. After heavy rainfall currents can be strong, making swimming inadvisable. Check conditions locally before planning a swim.
How does the Réserve du Trésor combine with Cacao?
Both destinations lie on the D5 road south of Cayenne. Visiting Cacao's Sunday market in the morning (Cacao is 80 km south) and stopping at the Trésor trailhead on the return adds approximately one hour of hiking with minimal extra driving.