The OLPP National Park is located on the south coast of Upolu and extends from the coast all the way to the interior of Upolu. The site therefore has the full range of ecosystems from the littoral forests on the rugged coastal ridges, to the lowland rainforest, extending to the ridge rainforests along the watershed area to the montane forests. The majority of the site is made up of the Lefaga volcanic rock which has not full weathered, making soil very infertile.
The most surveyed of all sites in Samoa, mainly due to its status as a National Park. It was first surveyed in 1972 during the process of identification of potential sites for a National Park. Four of the 8 globally threatened species of Samoa are present, as well as 11 restricted range species.
Non-bird biodiversity: Pteropus samoenses, Clinostigam samoense and Thaumatodon hystricelloides have been identified on site.
BirdLife International (2020) Important Bird Areas factsheet: O Le Pupu-Pu'e National Park. Downloaded from http://www.birdlife.org on 27/01/2020.