FAQ PROUND NUMBERS SOME FACTS OF OSA The pristine rainforests and the rugged natural beauty of the Osa Peninsula make this region among the most beautiful areas in Costa Rica.Named by National Geographic as “the most biologically intense place on earth”The Peninsula is estimated to house 2.5% of the biodiversity of the entire world323 endemic species of plants and vertebratesThe largest population of scarlet macaws in Central AmericaMore than 4,000 vascular plantsMore than 10,000 insectsMore than 700 species of trees (which is more than all the Northern temperate regions combined)463 species of birds140 mammals, including 25 species of dolphins and whales CONTACT US Just pack and go! Let leave your travel plan to travel experts! Your name Your email Subject Your message (optional)