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An undiscovered or rarely visited island somewhere having to be in the Pacific. My best guess.
I doubt there's any island larger than a rock that noone has landed on. (For some time people even specifically sought out islands that don't even have vegetation, to mine nitrogen). Anything larger than a km surely someone would have explored more. So points on those islands would at most be some hundreds of meters.
Given how few islands and how much ocean there is, any island is much more interesting and thus more likely to have had someone visit than some comparable location in the ocean without an island.
Good points. It all points to the least explored area of Antarctica being the closest answer to OPs question.