Atoll of an atoll is very small in comparison to the total area. Atoll islands are low lying, with their elevations less than 5 meters (9). Measured by total area, Lifou (1146 km²) is the largest raised coral atoll of the world, followed by Rennell Island (660 km²). More sources however list as the largest atoll in the world in terms of land area Kiritimati, which is also a raised coral atoll (321.37 km² land area; according to other sources even 575 km²), 160 km² main lagoon, 168 km² other lagoons (according to other sources 319 km² total lagoon size). The
Dongsha Atoll National Park a circular atoll in diameter, with tropical monsoon climate. It is administered under Qijin District, Kaohsiung City. Seagrass Beds are well formed in the atoll and in adjacent waters, providing rich bio-diversities of marine life from fish, jelly fish, squid, sicklefin lemon sharks, and rays to rarer sea turtles, Dugongs, and cetaceans (dolphins and whales). Recovery of green sea turtles has especially been noted. Possible use of the atoll as a breeding ground by lemon sharks have been speculated due to the numbers of infants that have been discovered. Dongsha Atoll National Park The Dongsha Atoll National Park () is