Well south of Easter Island are Macquarie Island (south of New Zealand) and the tiny islands south of Isla Santa Ines heading down to Cape Horn. But, as technically the Pacific reaches Antarctica (as do the Atlantic and Indian Oceans - the names Antarctic and Southern Ocean are not official), then Roosevelt Island would, I think be the one. It appears to be the most southerly island of all, too. It is under ice, so if you want an island that is free of ice, then Petra Island would fit the bill.
The are we are talking about here is the Ross Sea, which is considered as an arm of the South Pacific Ocean. Roosevelt Island is situated in the Ross Ice Shelf. It is unclear if this is a part of the Pacific Ocean. If it is, there are also some smaller islands under the shelf which are situated south of Roosevelt Island. They are unnamed on my map. I donĀ“t find Petra Island. To me Ross Island looks to be the southermost island in the Ross Sea, just north of the Ross Ice Shelf.
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