Three small elongated islands up to 2.3 km (1.4 miles) in length are all that remains of Maug volcano. The islands form the northern, western, and eastern rims of Maug’s largely submerged caldera. The highest point reaches 227 meters (745 feet) above sea level and the caldera has an average submarine depth of about 200 meters (656 feet). The natural harbor contains a twin-peaked central lava dome that rises up from the seafloor to within a few fathoms of the surface. View more
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