The Erikub Atoll is an atoll located in the central area of the Ratak Chain in the Marshall Islands. The atoll lies slightly south of a slightly larger atoll called Wotje. An atoll is a type of low, coral island found in tropical oceans and consisting of a coral-algal reef usually surrounding an interior body of water called a lagoon or peninsula. ... The Ratak Chain is a chain of islands within the island nation of the Marshall Islands. ... Wotje Atoll is an atoll of 75 islands in the Pacific Ocean. ...

There are 6 islands which combine to create a total land area of 1.53 km², one of the smallest in the Marshall Islands. The 6 islands surround a central lagoon which covers an area of 230 km². This mid bay barrier in Narrabeen, a suburb of Sydney (Australia), has blocked what used to be a bay to form a lagoon. ...