Introduction to Gomantong Caves: Gomantong Caves, located in the center of the Gomantong Rainforest Reserve, is composed of two intertwined caves. It is called the world's top edible bird's nest distribution center by the World Wildlife Fund (WWF). A boardwalk about 90 meters high has been built in the cave. From February to August every year, you can see professional bird's nest gatherers collecting bird's nests.