"An annular depression that may not be continuous, located at the base of many seamounts, islands, and other isolated elevations."^^ . "moatan"^^ . _:b1217397 . "ENVO:00000536"^^ . "moatan"^^ . "ENVO"^^ . . . _:b1217397 . _:b1217397 . "Geonames:U.MOTU"^^ . _:b1217397 .