Northwestern Costa Rica - White Cliffs National Wildlife Refuge Refugio Nacional de Fauna Silvestre Peñas Blancas

This refuge includes 2,400ha/5,928ac of land located on a steep southern arm of the Cordillera de Tilarán. Elevations within the refuge range from less than 600m/1,962ft to over 1,400m/4,592ft above sea level, hence the variation in altitude produces different types of forests. The terrain in this refuge is rather rugged, with only two hiking trails.

Tropical dry forest is found in the lower southwestern sections of the refuge, semi-deciduous dry and moist forests in the middle elevations, and premontane forest in the higher northern sections. Animals are scarce due to logging in the area before the creation of the refuge.

The name Peñas Blancas means "white cliffs" and refers to the deposits of the calcium remnants of diatoms (single-celled organisms) found in the reserve. The National Parks Services (SPN) administers the refuge.