Kapingamarangi is an atoll and a municipality in the state of Pohnpei of the Federated States of Micronesia. It is by far the most southerly atoll or island of the country and of the Caroline Islands, 300 km south of the next southerly atoll, Nukuoro, and 740 km southwest of the main island of Pohnpei state.
The total area of the atoll, including the lagoon, is 74 km². Out of this, 1.1 km² is land area, spread over 33 wooded islets on the eastern side of the atoll. The western reef rim of the atoll is almost submerged at high water.