The waters surrounding the island are extremely dangerous and any ship sailing nearby may easily get caught in a storm or tidal wave, and become shipwrecked on this dangerous island.
If you become shipwrecked, the only way to leave is to collect Wood to repair your ship, but be careful! You might become the next sacrifice of "The Cult", or be murdered by the lost souls of previous shipwrecked crews.
How go to Goroma???? -.-