Obo Natural Park The Obo Natural Park is located in Sao Tome and Principe and it covers about 235 square kilometers. The name is actually misleading as it is registered as a national park. You’ll see many ferns here and if you’re lucky, you’ll see a golden leather fern. The animals here also are very special like the manatees, treefrogs, and even Newton’s grassland frog. One of the most amazing sighting here includes seeing the leatherback sea turtle, giant sunbirds, and the Sao Tomean Shorttail. Come here for a visit and you won’t be disappointed.