This park is located in the mountain range of Talamanca, consider like the mountain system cover of tropical forest biggest in the country, with a height between 100 Mts. Over the sea level, the Kamuk hill with 3.549 Mts. And the Dorika hill with 3.280 Mts. altitude.
The Executive Decree No. 13324-A created the park, on February 4, 1982. It has an extension of 193.929 hectares.
It is denominated "International" because it extends to the neighbor country of Panamá, in which 207.000 hectares of territory are protected.
The park is surround by the Native Reserves of Chirripó, Tayna, Telire and Talamanca in the Atlantic and by the Reserves of Ujarras, Salitre and Cabagra in the Pacific. In 1982 the UNESCO declares it Reserve of the Biosphere "La Amistad" and in 1983 was denominated a "Place of World Patrimony", due to its exceptional universal value even through the scientist point of view like the conservation and natural beauty.
It's surface includes humid, rain and cloudy forests, regions with pecks and rocks where you can find cold small cienaga.
According to the classification of the life zones of Holdridge in the Park we can found seven life zones and six transition zones. These characteristics join to the fact that Costa Rica is part of the biological bridge and filter between South America and North America, is consider the great value of this park. We can found a big number of extraordinary habitats, result of the different heights, soil, climate and topography.
The mix forests or cloudy forests, very tall and humid cover most of the territory, and include big oaks cover with plants.
The most common ferns found are the "Lamaria", of two Mts. tall and also the "esfagno Sphagnum". Some of the biggest trees are the oaks, cedars and cypress.
They have observed more than 263 species of amphibian and reptiles, the most common are the lizards, salamander, etc. Among mammal are the danta, puma, jaguar, white face monkey, etc.
The bird wild life is represented by 400 species; in which we can notice the eagles, "quetzal", etc.
Should be mentioned that the PILA protects the middle and superior sockets of the Rivers named, "Ceibo", "Cabagra", "Guineal", "Singri" and "Canasta" which principal collector is the river Grande de Terraba in the Pacific. In the Atlantic appear rivers like the Banana, "Telire", "Coen", "Lari" and "Urion". It's principal collector is the Sixaola River. The capability of these sockets to provide drinkable water to the population is very good considering the fast increase of this one.
The orografic system helps the humidity of the oceans travels, leading to heavy and constant rains, and increasing the risk of inundation and collapse. This was the principal reason for creating this park.