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I believe that the answer is Urea.
The reason why Greenland is so sparsely populated is because, despite its name, Greenland is actually covered with ice (almost 80% of the territory is ice), meaning that it's very hard for people to settle.
Pearl Harbor is your answer
,
We know a great deal about the Arctic Ocean. Either your,
1) Map is outdated, or
2) White represents ice.
