Mayumba National Park, Marine national park in southwestern Gabon.

Mayumba National Park is a thin strip of beach, dunes, savanna and rainforest in extreme southern Gabon, between Mayumba and the Congo border. It runs 60 km along the coast and 15 km out to sea, making it Gabon's only primarily marine park. The land rises from the shore into forested ridges, with mist lying in the valleys between them.

Mayumba National Park was created in 2002 by Gabon's president Omar Bongo Ondimba, together with a network of 13 national parks protecting close to 11% of the country's land and sea territory. It covers roughly 970 km2, including a strip of beach and coastal vegetation about 1 km wide and 60 km long between Mayumba and the Congo border.

The park lies between Mayumba and the Congo border, where the coastline is marked by wide sandy beaches and freshwater or brackish lagoons. Some lagoons reach far inland, mixed with islands, channels and rivers, and support mangroves, flooded forests and swamps. Hippos, crocodiles and manatees live in these waters, and the mangroves serve as nursery habitat for a wide range of fish species.

The best time to visit is during sea turtle nesting season from October through March, with peak activity between December and January. The protected beaches are most active during these months and offer the best chance to witness this natural event.

The park's 60 km of beach is described as among the most important leatherback turtle nesting sites on Earth. It is Gabon's only primarily marine park, extending 15 km offshore to protect dolphins, sharks and migrating humpback whales.