On the Caribbean slopes of the Talamanca Range, this reserve includes the upper reaches of the Ilitoy and Cerere Rivers. There is a road, partly paved and partly gravel, from
Puerto Limón to the administration headquarters in the Estrella Valley.
This park is 219 km road from the city of San José. It is one of the most important examples
of the biological complex formed by evergreen forest, in the country; the high precipitation encourages the development of this type forest so there are some trees that rise a
hight of 50 meters. The fauna can be difficult to observe as many species are nocturnal or live in the high canopy. In spite of this some 115 bird species have been identified.