Columbia Forest Reserve is one of the largest protected areas of rainforest in Central America. Just north of San Jose village, the area is known for its Karst terrain, which is made up of irregular limestone in which the erosion has produced sinkholes, fissures, underground streams and caves. With an elevation that varies from 1,000 to over 3,000 feet, the ecosystem is very diverse. From high bush to old growth tropical rainforest, the Columbia Reserve is full of diversity. Come explore, but watch out for sinkholes—some are 800 feet deep.