Well Gol D Roger's treasure was one piece but he didn't descibe what kind of treasure it was.
My speculation is the one piece is not on the last Island, i.e. laugh tale and instead the last island itself is the one piece.
What I mean to say is that 800 years ago the there was no partition of four seas and it all existed on one large mass of land which is now buried with all its treasures with some kind of natural or artificial barrier.
My speculation is the one piece is not on the last Island, i.e. laugh tale and instead the last island itself is the one piece.
What I mean to say is that 800 years ago the there was no partition of four seas and it all existed on one large mass of land which is now buried with all its treasures with some kind of natural or artificial barrier.