Santa Rosa National Park, the first national park established in Costa Rica, was created in 1971. The park covers an area of approximately 495 sq km (191 sq mi).
Santa Rosa was originally a farm located in northwestern Guanacaste Province. Today an old hacienda building, "La Casona," functions as the monument commemorating the fallen heroes of the different battles that took place here.
It is part of the Area de Conservación Guanacaste World Heritage site, originally created to protect the scene of the Battle of Santa Rosa. It is also within the larger national Guanacaste Conservation Area.
The Interamerican Highway (Pan-American Highway) is along its eastern edge, where the adjacent Guanacaste National Park is located.
Ten unique natural habitats are within in the park. They include savannas, deciduous forest, marshlands and mangrove woodlands.
Fauna includes coyotes, peccaries, white-nosed coatis, Baird's tapirs, sea turtles, and terrestrial turtles. The three species of monkey are Geoffroy's spider monkey, mantled howler and white-headed capuchin. Several cat species are also present: jaguarundi, ocelot, cougar and jaguar, though they are rarely seen.