Ferry or seaplane access only. 66-year wolf-moose study still running.
An island archipelago in Lake Superior accessible only by ferry or seaplane. Isle Royale is the least-visited national park in the lower 48, and the only one that closes entirely for winter. The wolf-moose study here is the longest continuous predator-prey research in history — running since 1958. You can backpack the 42-mile Greenstone Ridge Trail end-to-end in four days without seeing another person.

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