Shell island treasure chart - Exploring - Arcane Odyssey

I have been struggling with this treasure chart for quite some time now, I just cannot figure out where it might be. Anyone got some tip for this?

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Shell island treasure chart - Exploring - Arcane Odyssey

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Arcane Odyssey] looking for treasure in shell island moment:

Shell island treasure chart - Exploring - Arcane Odyssey

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Legendary Treasure Chart. Need help!