The Obô Natural Park of Príncipe covers 85 km² of the island's southern interior, protecting the last remaining block of primary rainforest. Established in 2006, the park encompasses steep volcanic peaks, dense canopy, and watercourses that drain into the sea on three sides. It is the stronghold of the island's extraordinary endemic fauna, including eight bird species found nowhere else on earth.
Access is on foot with a local guide — the park has no marked trails and the undergrowth is thick. Day hikes from the park boundary take between three and eight hours depending on your destination. The Fundação Príncipe, based in Santo António, coordinates trained guides and manages access; contact them before setting out. Early morning starts are essential for birdwatching, and you should expect mud on the trails year-round.