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
Addu Atoll Addu Atoll Unlike other atolls of Maldives, Addu city possesses a natural anchorage within the city basin, as the atoll is land-locked with large islands surrounding the atoll. This results in a natural harbor that is very calm and safe for sea vessels at all times, and is not affected by seasonal changes. The atoll possesses four channels which lead into the lagoon. In the north are the Kuda Kandu and Maa Kandu, in the south the Gan Kandu, and the broad Villingili Kandu is to the southeast. There are unique features in the islands of Addu Atoll. The islands