hahaa...I hunted through all these same places that you're guessing so I'm reliving my own frustrations.
However, Amatignak is in the Western Hemisphere, not in the Eastern Hemisphere.
In fact: Amatignak Island is a member of the Delarof Islands (western Andreanof Islands), in Alaska's Aleutian archipelago. The south-most point of Alaska is on this island, as well as the highest western longitude of the United States and North America.
Keep looking in that immediate area but just over the IDL in the eastern hemisphere. If you're looking at a map, you'll notice this island has a little "lake" near the middle of it since it is basically a volcano like most islands around here and I suspect that's part of the caldera.
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