step #1 locate the 4 tiles
step#2 mark them on your map
step#3connect them until they connet
step#4 dig on the x
step #5you found a treasure map!!!
There are many uncharted islands, at least one per map.
it is one of the uncharted island in the 2nd sea chart
it is a mode unlocked on freedles island where with another player of phantom hourglass can trade items with you
Molaida Island
you get the hammer in pyramid island
On the island of ruins
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Cannon island
In Link and the legend of Zelda, Phantom Hourglass, you get the hammer in the isle of ruins, or the island of the dead.
I think the island's called 'Anouki Island'.
harrow island is in the southeastern sea.
yes you get them in pyramid island temple