Corcovado National Park was established in 1975 to protect 424 square kilometers of the Osa Peninsula's lowland rainforest — the largest stretch of primary forest left on the entire American Pacific coastline. There isn't another piece of it this size, this intact, anywhere from Mexico to Chile.
That first comparison is the one worth sitting with. A park covering roughly a thousandth of one percent of the planet's land holds an estimated 2.5% of its biodiversity. Inside its boundaries: all four of Costa Rica's monkey species, all four sea turtle species that nest in the country, more than 140 species of mammals, 367 species of birds, 117 species of amphibians and reptiles, over 40 species of frogs alone, and more than 6,000 documented species of insects — a number that keeps climbing every time a research team goes back in.
Why It's Stayed This Way
Corcovado's intactness isn't an accident of remoteness, though the Osa's relative isolation has helped. It's the product of sustained, deliberate conservation work. The Corcovado Foundation, a Costa Rican nonprofit, has worked here since the park's earliest years and now operates across 9 of the country's 11 official conservation areas — funding ranger patrols, sea turtle monitoring, reforestation of degraded buffer land, and environmental education for the communities that border the park. Corcovado sits within the larger Osa Conservation Area, a designation that extends meaningful protection status beyond the park's own boundary into the surrounding peninsula.
None of this is passive. Illegal gold mining, poaching, and encroachment have all threatened the park at different points over the last five decades, and the fact that Corcovado remains this intact today reflects active, ongoing management — not a landscape that simply hasn't been discovered yet.
Titled property near Corcovado is genuinely scarce, and the reason isn't just distance from San José. It's that so much of the peninsula that could otherwise be developed is permanently protected by national park status — not a conservation easement that could be renegotiated, but a designation with real institutional weight behind it. That permanence is a big part of what a buyer is actually purchasing when they buy land near this park: not just a view of the forest, but the durability of that view.
Puerto Jiménez remains the practical gateway for this part of the peninsula — a short domestic hop from San José puts you within reach of a park that National Geographic and biologists alike still describe, without much argument, as one of the most biologically dense places left on Earth.