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They come sometimes to take you other places,for example he might take you to new moon island(darkrai event) do you get it? some are just graphics... Sailors go to islands in order to explore, trade, or just take a break from sailing. What the reasons are depend highly on what island is being discussed.
everything
If the Maldives islands weren't heeded the islands could have disapered
Look around the islands. It might be different for you but i found the 13 wishes advertisment in skullduggery island
on the islands but i might be wrong
the Caribbean islands
Yes. The satellites see everything bigger than a license plate.
No, the sirens sing to sailors who pass by islands with cliffs and either they jump ship and drown unable to reach the sirens atop the cliffs, or a sailor might navigate the ship into the cliffs to reach them thus killing everyone.
No, islands are land like America, just in one spot. It's not like land is a boat. Some Islands MIGHT lose some shape when something like an earthquake hits, some islands MIGHT gain shape from a volcano eruption. It adds more to the island.
you might have heard of Japan, east asia australia, australisia iceland, europe antartica, antartica madagascar, africa falkland islands, s. america if you want all the islands then you might be here till next christmas...
The legendary Galapagos Islands, they're 1 degree North so there might be somewhere on the zero line.