Guanacaste National Park, in Spanish Parque Nacional Guanacaste is a national park in northern Costa Rica. The park is part of the Area de Conservación Guanacaste World Heritage Site, and stretches from the slopes of the Orosí and Cacao volcanoes west to the Interamerican Highway where it is adjacent to the Santa Rosa National Park. It was created in 1989, partially due to the campaigning and fund-raising of Dr. Daniel Janzen to allow a corridor between the dry forest and rain forest areas which many species migrate between seasonally. The park covers an area of approximately 340 square kilometers, and includes 140 species of mammals, over 300 birds, 100 amphibians and reptiles, and over 10,000 species of insects that have been identified. It was this high density of bio-diversity that encouraged the Costa Rican government to protect this area. The Guanacaste National Park weaves the neighboring Santa Rosa National Park with the high altitude forests of the two volcanoes, Orosi and Cacao, and the rainforest of the Caribbean in the country's north.
The Tempisque River flows through the park's lowland areas. There are dry forests at lower elevations and cloud forests at higher elevations. There are several trails running through the park that offer up good hiking. The trail leading to the Orosi Volcano has pre-Columbian petroglyphs near the plain at El Pedregal.
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