João Vieira and Poilão Marine National Park holds one of Africa's most astonishing natural spectacles: the mass nesting of green turtles on the small sacred island of Poilão. Every season, tens of thousands of turtles come up its beaches at night to lay their eggs, at one of the largest nesting sites for this species in the whole Atlantic and the most important on the African continent. Watching these ancient animals dig in the sand under the stars is an experience you won't forget.
The park, at the southern end of the Bijagós, is a marine world of six islands, seagrass meadows, mangroves and reefs, also home to dolphins, sharks, fish and birds. And Poilão, its heart, isn't just a turtle sanctuary: it is a sacred island for the Bijagó people, the setting for initiation rituals, and access is strictly protected for both conservation and spiritual reasons.
This guide explains how to understand and visit this exceptional park: what the green turtle nesting phenomenon is and when it happens, how the expedition from Bubaque is organised with a guide and permits, which conservation rules to respect, and why Poilão is a sacred place that demands the utmost care. A destination only for travellers committed to nature, which rewards them with one of the planet's great wildlife spectacles.
João Vieira and Poilão Marine National Park was created in 2000 to strictly protect the southern end of the Bijagós, within the Biosphere Reserve declared by Unesco in 1996. Its worldwide fame comes from green turtle nesting on Poilão, one of the largest in the Atlantic and the largest in Africa, with tens of thousands of nests per season. Poilão is also a sacred island of the Bijagó people, linked to initiation rites, which has helped preserve it for centuries. Today IBAP and local communities protect and monitor the park. The natural and cultural history of the place is told on our history page.
Read the full history ↓Eighty-eight islands of mangrove, beach and savannah, home to the region's only matrilineal culture, hippos that swim in salt water and one of the largest turtle nesting beaches in the Atlantic.
Read the history of The Bijagós archipelago →No exact prices: a scale from $ (budget) to $$$$$ (luxury), with 2-3 options per category.
Origins, formation and what the sources say.
At the far south-eastern end of the Bijagós archipelago, where the islands scatter into the Atlantic off the coast of Guinea-Bissau, lies a small group of islands and islets of enormous natural importance: João Vieira, Meio, Cavalos, Poilão, Cabras and Aweto. They are low-lying lands of sand and vegetation, surrounded by crystal-clear waters, seagrass meadows, mangroves and seabeds teeming with life.
Like the rest of the Bijagós, these islands were formed from the sediments that the great Guinean rivers have poured into the ocean over thousands of years. Their remoteness and small size long kept them free of permanent human settlement, which, together with their sacred status for the Bijagó people, helped preserve ecosystems now considered of global value.
That isolation is exactly what made possible the phenomenon that has brought worldwide fame to this corner of the Bijagós: the mass nesting of green turtles on the tiny island of Poilão. For thousands of years, quiet, remote and protected beaches have given the turtles a safe place to carry on the species, generation after generation.
Long before Western science took notice of its turtles, Poilão was already a special place for the Bijagó people. The island is one of the most sacred sites in their spiritual geography, linked to the initiation rites that shape life in these matrilineal, animist communities. In the Bijagó worldview, certain places, animals and objects are sacred, and their use is governed by strict rules and prohibitions.
That sacred status had an unexpected and fortunate consequence for conservation: for centuries, ritual restrictions limited access to Poilão and the use of its resources, in effect protecting the island and its beaches long before any legal protection existed. Bijagó beliefs acted as a natural sanctuary, shielding the place from overexploitation.
This bond between the sacred and the natural is one of the keys to understanding the park. Conserving Poilão is not just a scientific or legal matter; it rests on a living cultural heritage. That is why any visit must be made with the utmost respect for the beliefs and rules of the Bijagó people, for whom these islands are much more than a landscape.
The phenomenon that has put Poilão on the global conservation map is the nesting of the green turtle (Chelonia mydas). On barely two kilometres of beach, this tiny island hosts an average of around 27,000 nests per season (according to 2013-2017 data), with record years exceeding 60,000. An estimated 5% or so of the world's green turtle population nests here, making Poilão the largest nesting site in Africa and one of the three largest in the entire Atlantic.
Every season, mainly from the middle to the end of the year, thousands of female turtles travel huge distances across the ocean to return to these beaches (often the very ones where they hatched) and lay their eggs. The density is so high that a turtle sometimes digs her nest on top of another's clutch, 'dooming' those eggs. Weeks later, the hatchlings emerge from the sand and race towards the sea, starting a cycle that has been repeating for millions of years.
This spectacle, one of the greatest wildlife events in Africa, is both fragile and magnificent. The turtles' survival depends on their nesting beaches staying quiet, dark and protected. Hence the crucial importance of conserving Poilão, not only for Guinea-Bissau but for the green turtle on a global scale.
Formal recognition of these islands' value came in 2000, when the João Vieira and Poilão Marine National Park was created within the Bolama-Bijagós Archipelago Biosphere Reserve, which Unesco had declared in 1996. The park covers some 49,500 hectares, about 95% of them marine, and takes in the group's six islands and their surrounding waters, with their seagrass meadows, mangroves and reefs.
Strict protection aimed to safeguard an exceptional marine ecosystem and, above all, the Poilão turtle sanctuary. Alongside its natural value came an implicit recognition of the role the Bijagó communities had played over centuries in conserving the site. The park was thus born as a bridge between modern legal protection and traditional protection rooted in the sacred.
Management was placed in the hands of Guinea-Bissau's environmental institutions, now under IBAP, with support from international conservation organisations. Protecting a treasure of global importance in one of the poorest countries on the planet is an enormous challenge, demanding resources, monitoring and the constant involvement of local communities.
Today, the João Vieira and Poilão Marine National Park is a remarkable example of conservation in West Africa. Every season, IBAP and its partners monitor the nesting: they count nests, tag turtles, patrol the beaches against poaching and study the turtles' migration routes, which link Poilão with feeding grounds spread across much of Africa's Atlantic coast. Scientific studies have revealed the global scale of these beaches' importance.
One of the most unusual tasks is egg rescue: because nest density is so high, many clutches are 'doomed' when later turtles dig over them. Park staff rescue those eggs and move them to safe beaches, such as the one on João Vieira, for controlled incubation, maximising the number of hatchlings that reach the sea. It is hands-on wildlife management at its purest.
The park faces serious challenges: scarce resources, fishing pressure, climate change on low-lying islands and the difficulty of patrolling such a remote area. Responsible ecotourism, tiny but growing, is seen as a way to fund conservation and benefit local communities. João Vieira and Poilão sum up a powerful lesson: how nature, science and sacred culture can join forces to protect one of the great spectacles of life on Earth.
