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.