Pseudo-atoll Pseudo-atoll A pseudo-atoll, like an atoll, is an island that encircles a lagoon, either partially or completely. A pseudo-atoll differs from an atoll as established by several authorities, such as how it is formed (not by subsidence, nor by coral). It is considered a preferable term to "near-atoll". There is a need for rigorous definition of "pseudo-atoll" before it can be accepted as a general term. Alexander Agassiz gave the term pseudo-atoll to "any ring-shaped reefs not formed as a result of subsidence". while Norman D. Newell and J. Keith Rigby called such reefs non-coral. and "We conclude that almost-atoll
Oroluk Atoll Oroluk Atoll Oroluk Atoll is an atoll belonging to Pohnpei State in the Micronesia. Oroluk Atoll stretches from the northwest to the southeast with a length of about and an average width of . The lagoon's surface is roughly . The more than 25 sandy islets and banks, predominantly on the eastern rim of the atoll, have been washed away by cyclones through the years. Only one island remains, Oroluk Island in the very northwest corner of the atoll. Oroluk Atoll is believed to have been first discovered and named by navigators from Namoluk Island in the Mortlock Islands. The