Florian Triangle

The Florian Triangle (魔の三角地帯 [フロリアン･トライアングル], Ma no Sankaku Chitai [Furorian Toraianguru], literally translated as Zone of Demonic Triangle) is the stretch of sea that one has to cross over to reach to Fishman Island. It is covered in a fog so thick that it blocks out all sunlight. According to Kokoro, many pirate and commercial ships mysteriously go missing every year and some times a ship will be found sailing without any people aboard. Due to this mystery it is also been said that there are many haunted ships with dead bodies sailing across the sea (throught it is revealed that all this is attributed to Brook). During the Thriller Bark arc, the Straw Hats went to the Triangle on their way to Fishman Island and discovered that Gecko Moria was using it to trap victims to be used for his zombie army.

Though Moria's scheme can be attributed to some of the many disappearances that happened in the Triangle, the mystery of ships disappearing in it has long been happening even before he came on his ship, Thriller Bark, ten years before the current timeline. This mystery is confirmed by an unknown ominous entity larger than Thriller Bark that was barely seen by Captain Lola through the fog. It is so large that it completely dwarfs Thriller Bark, the world's largest pirate ship, in sheer size, possibly making it the world´s biggest creature to appear in the series thus far (except maybe for Sanjuan Wolf and the Sea Kings of the Calm Belt). It´s unknown if the creature is a Sea King or another kind of being.