This article is about an insular region in the United States. For the island grouping in the Dutch Caribbean, see ABC islands (Lesser Antilles). For similarly named localities elsewhere, see ABC#Places.
Most of the islands' area is federally protected wilderness. The city of Sitka has its urban center on the west coast of Baranof Island. Outside of Sitka, there is only minimal industry and human presence on the islands, despite the fact that Admiralty (7th), Baranof (10th) and Chichagof (5th) are among the largest islands in the United States.