Jaya is a forest-covered spring island in Paradise that was once shaped like a skull and much larger than it is now. Due to over half of it being launched into the White-White Sea by the Knock Up Stream, only the part that makes up the skull's mouth remains.
The island was ruled by the Shandia four hundred years ago, who guarded the Poneglyph located in their city of gold, but they too were launched into the sky. In present day, however, the island is mostly uninhabited other than a few towns. The island seems to be a major base for pirates, one of which is Mock Town. This a prime place for pirates to find recruits to become apart of their crew. Due to the strong pirate presence on the island they marines and revolutionaries tend to be wearily when they have to come to island.