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It is a group of islands in Alaska.
You likely mean either the Aleutian Islands or Alexander Archipelago.
Prince Edward Islands
It is off the southeastern coast of Alaska. Sitka is on the archiipelago's Baranof Island and Ketchikan is on its Revillagigedo Island.
Chatham Strait is a narrow passage of the Alexander Archipelago in the south-eastern region of the U.S. state of Alaska.