drowned atoll

drowned atoll

[¦drau̇nd ′a‚tȯl]
(geology)
An atoll which has not reached the water surface.
References in periodicals archive ?
Union Banks is a large drowned atoll located 230 km west of Palawan, well within the Philippines' EEZ.
A large, drowned atoll in the center of the Spratly archipelago, Union Bank has about 20 reefs whose ownership is disputed by China, the Philippines and Vietnam.