The Children's Eternal Rain Forest (CERF) is located in the Tilarán mountain range, in northwestern Costa Rica. This range presents a steep sinuous topography which is characterized by peaks and mountain ridges, valleys and canyons as well as abundant rivers of rapid currents that drain both Pacific and Atlantic slopes of the country.

The CERF is 22,000 hectares (54,000 acres) in size and encompasses primary and secondary forest as well as regenerating areas. The CERF, along with other private reserves and the Arenal National Park, forms a forest block under protection of about 50,000 hectares (110,000 acres).

In general CERF can be categorized into three forest types: seasonal evergreen forest, Cloud forest and aseasonal rain forest. This latter type being the most representative within the reserve. However, within the CERF area 6 out of 12 life zones present in Costa Rica are found, as well as a great variety of habitats between 450 and 1,800 above sea level.

Within CERF we have management areas where we maintain infrastructure for research, education and protection. We also have experimentation areas with native species of trees and forest restoration treatments. In addition, we maintain trails to be used by ecotourists, students and researchers.