group of about 1,100 islands (actually the tops of a submerged section of the Coast Ranges) off the coast of southeastern Alaska, U.S. Named by the U.S. Coast and Geodetic Survey in 1867 to honour Alexander II, tsar of Russia, the islands are included within the Tongass National Forest and extend southward from Glacier Bay and Cross Sound to the Dixon Entrance. Among the largest islands (north-south) are Chichagof, Admiralty, Baranof, Kupreanof, Kuiu, Mitkof, Wrangell, Prince of Wales, and Revillagigedo. The chief cities are Sitka on Baranof and Ketchikan on Revillagigedo, and the islands are chiefly supported by lumbering, fishing, fur collecting, and mining. They were once the exclusive home of Tlingit and Haida Indians (especially noted for their totem poles). The irregular shorelines of the islands are separated from the mainland by deep, narrow channels that form part of the picturesque Alaska Marine Highway system, or Inside Passage. Glacier Bay National Park and Preserve forms part of the archipelago and, together with Kluane National Park and Reserve (Yukon Territory, Canada), Wrangell–St. Elias National Park and Preserve (Alaska, U.S.), and Tatshenshini-Alsek National Park (British Columbia, Canada), it comprises a World Heritage site, part of the largest internationally protected area in the world. Sitka National Historical Park and Misty Fjords and Admiralty national monuments are also within the archipelago.