Pseudo-atoll

A pseudo-atoll is a geological formation that resembles an atoll but does not meet the strict criteria to be classified as one. Atolls are typically ring-shaped coral reefs that encircle a lagoon, formed from the growth of coral around a sinking volcanic island. In contrast, pseudo-atolls may exhibit similar circular or oval shapes but lack certain key characteristics, such as a true lagoon, sufficient depth, or the coral reef structure that characterizes genuine atolls.