The Lowland Rain forests of Costa Rica are the most complex biological communities that exist. A typical hectare (2.5 acres) of Cost Rican rain forest might be home to nearly 100 species of trees. The country comprises only 0.01% of the earth's landmass, yet is home to 5% of the planet's biodiversity. There are more than 10,000 identified species of plants, 850 species of birds, 800 species of butterflies, and 500 species of mammals, reptiles, and amphibians found here.

Costa Rica's lowland rain forests are true tropical jungles. Some are deluged with more than 200 inches of rainfall per year, and their climate is hot and humid. You can find these lowland rain forests along the southern Pacific coast and Osa Peninsula, as well as along the Caribbean coast. Corcovado, Cahuita, and Manuel Antonio National Parks, as well as the Manzanillo-Gandoca Wildlife Refuge are examples of lowland rain forests.

Good places for hiking are Braulio Carrillo National Park, near San Jose which contains rain forest and cloud forest, and the hot and humid rain forest in La Selva Biological Station. On the Pacific coast, Corcovado National Park and Marenco Wildlife Refuge have well maintained but muddy and steep trails where you can meander for hours through impressive primary forests.

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