Feeshworld is a ocean, beach thermed hangout area by user Marie. A main chunk of the area is the underwater ocean gallery filled with many different types of sea life. Also as the description states, there's also parkour areas visitors can play around in.
Feeshworld currently ranks as the 7th most liked area on Manyunity, making it one of the more popular hangout locations in the game. Feeshworld has a dedicated discord that other users are allowed to join on, and a link to join can be found on a writable in the area.