Omatsuri Island is supposedly a resort island led by Baron Omatsuri. In actuality, however, this was all a ruse to attract strong pirates for Omatsuri to feed his man-eating plant, the Lily Carnation, and all of the people were created by that plant. Once Omatsuri and his plant were defeated, the island became empty again. This is the location of Baron Omatsuri and the Secret Island, the sixth One Piece movie.
Many years ago, Omatsuri washed up on the island after his crew was killed in a storm at sea. There, he met Lily Carnation, who revived his crew as plants. Omatsuri, Lily, and their revived crew set up the island as a "resort", which was actually a set of trials used to capture pirates to feed to Lily.
Goldfish Pond is the first arena used for the Straw Hat Pirates for the tournament. The Goldfish Pond was practically a large water area where Rosario resides. Muchigoro`s task was to catch the most fish via a net and win the challenge but he lost the match due to Chopper and Robin.
Brief`s Hideout area is a very big underground tunnel that goes through one passage to another. Brief had built it so greatly that it spreads from the resort building through the mountain top. Only Brief, Luffy, Papa, Rosa, Rick and Daisy entered it as a hideout from Baron Omatsuri`s rampage by the Lily Carnation.
Despite being run by pirates, the island has a variety of wildlife. A variety of insect and bird species was seen. The most notable animals have been the giant goldfish, Rosario, and the goat owned by Brief.