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As we all know the final island in one piece is Raftel, I thought about a theory of where the island is... so lets start:

After the starting song we can see a log pose in a boat underwater and the log pose is pointing down,after a big fish moves the log pose its still pointing down which means there is an island in the see, We know that you need 4 poneglyphs to know where Raftel is and that only the pirate king crew were  there,Also: Crocus told Luffy that if he will follow the log pose he will reach the end of grand line, and it was stated the Crocus does not usually lie,Also one of the yonkos could explore the whole grand line using south birds to travel to any direction from the island before Raftel and no one found it yet, which means that Raftel is not an island on the sea that you can see without knowing where it is, which explains why the log pose is pointing down while underwater because Raftel is there and this is why you need the 4 poneglyphs to find it because its right below the point that is shown by the poneglyphs. Again this is just a theory. written by Nadav Weiss