Fish-Man Island

The Underwater Wonderworld Gyojin Island The island that appreas to be underwater. "You'll understand how to go down when you'll get there," as was stated by Kokoro, claims that there is a unique way of getting down there.

The Furorian Triangle
The island is protected by a horrifying place that sucks ships and crews to an unknown fate. It is stated that 100 ships disappear there every year.