The Bijagós Archipelago holds Africa's biggest green-turtle nursery. On Poilão, a sacred island barely a kilometre across, some 20,000 female green turtles come ashore each season to lay — roughly five percent of all the nesting green turtles on Earth. The archipelago itself is a drowned delta: the Geba and Grande de Buba rivers once emptied here, and rising seas left their sediment as 88 islands and islets, the only active deltaic archipelago on Africa's Atlantic coast. Barely twenty are permanently settled; the rest are mangrove, palm forest, sandbank and tidal flat. Those flats are why between 600,000 and 900,000 waders — bar-tailed godwits, red knots, whimbrels — spend the northern winter here, after flying down the East Atlantic Flyway from the Arctic. A UNESCO Biosphere Reserve since 1996, the archipelago became Guinea-Bissau's first World Heritage Site in July 2025, listed under the Bijagó name Omatí Minhô.
Getting here still means a boat: a launch from Bissau to Bubaque when the dry-season sea is flat, or a crowded pirogue and a long wait when it isn't. On Bubaque, dirt roads run through palm groves to empty crescent beaches where village cattle wander down to the tideline. On Orango, a guided walk across the savanna reaches the Anor lagoons, home to hippos that tolerate salt water and swim the channels between islands. Bijagó society runs through its women — they own the houses, inherit the land and choose their husbands, while men spend years climbing the grades of the fanado initiation. That religion is also why the turtles are still here: Poilão is a shrine, its interior forest closed to outsiders, and nobody sleeps on the island. World Heritage status has brought no hotels and no ATMs; the islands stay as slow and unvisited as before.