Just to make a valid point on this debate, the backdrop that has been shown scrolls across the screen; it doesn't remain in one place to show any definite location.

If an argument has to be made, I think the fact that islands exist, not the shape or location of the islands, is what matters.

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What if Majora's Mask was never made? / The last interesting timeline topic on ZU /
Disproving the Divine Prank myth