ActionWorld was a resort island on Dorumaa with a focus on sporting activities. It was Tropix island's closest neighbor, located to the south. During the Clone Wars, Kaminoan scientist Ko Sai had a facility hidden under the island which could only be reached by an underwater entrance. After her capture by Kal Skirata and Mereel, Skirata set off explosives to destroy the facility. This resulted in one of ActionWorld's sports fields subsiding. Delta Squad, also seeking after Ko Sai, spent some time excavating the field, seeking clues of Ko Sai's fate.