Alexander Archipelago

Alexander Archipelago
Name	Alexander Archipelago
Location	Southeast Alaska, United States
Major islands	Admiralty Island; Baranof Island; Chichagof Island; Revillagigedo Island; Prince of Wales Island
Country	United States
State	Alaska

Alexander Archipelago is a large group of islands located in Southeast Alaska, characterized by mountainous terrain, temperate rainforests, and complex coastal waterways. The archipelago lies between the Gulf of Alaska and the Inside Passage maritime route, forming an important ecological and cultural region connected to nearby Juneau, Sitka, Ketchikan, Prince Rupert, and Vancouver Island. Its islands and channels have shaped interactions among Tlingit, Haida, Tsimshian, European explorers such as Vitus Bering and George Vancouver, and later American and Canadian commercial interests.

Geography

The archipelago occupies the northern margin of the Pacific Ocean where the coastal range meets the sea, bounded by the Gulf of Alaska, Inside Passage, Southeast Alaska coastline, and the Canadian border. Major waterways such as Frederick Sound, Chatham Strait, Lynn Canal, Sumner Strait, and Icy Strait separate islands including Admiralty Island, Baranof Island, Chichagof Island, Prince of Wales Island, and Revillagigedo Island. The region’s topography links to the Coast Mountains and the Tongass National Forest, with fjords carved by glaciers associated historically with the Pleistocene ice sheets and modern alpine systems like Juneau Icefield. Population centers include Juneau, Sitka, Ketchikan, Petersburg, and Wrangell, which rely on marine corridors such as the Alaska Marine Highway and historically the Pacific Steamship Company routes.

Islands

Islands vary from large, inhabited landmasses—Prince of Wales Island, Chichagof Island, Baranof Island, Admiralty Island, Revillagigedo Island—to smaller islets and skerries near Gravina Island, Mitkof Island, Kupreanof Island, and Prince Rupert Island. Many islands host settlements like Craig, Alaska, Hydaburg, Sitka, Kake, Alaska, Angoon, and Hoonah, and are proximate to fisheries and hatcheries managed under authorities such as the Alaska Department of Fish and Game and regional corporations established by the Alaska Native Claims Settlement Act. Maritime features include passages used by commercial vessels, cruise lines like Holland America Line and Princess Cruises, and historic navigation routes mapped by explorers including James Cook and George Vancouver.

Geology and Formation

The archipelago’s foundation is tied to plate interactions among the Pacific Plate, North American Plate, and microplates within the Aleutian Trench and Fairweather Fault systems. Island geology displays metamorphic, igneous, and sedimentary units linked to terrane accretion events recorded in studies by institutions like the United States Geological Survey and universities such as the University of Alaska Fairbanks. Glacial sculpting during the Pleistocene created fjords, U-shaped valleys, and cirques; present-day geomorphology continues to be influenced by processes observed in the Juneau Icefield and volcanic activity associated with the Aleutian Arc and regional seismicity logged by the Alaska Earthquake Center.

Ecology and Wildlife

The archipelago supports temperate rainforest ecosystems within the Tongass National Forest, hosting old-growth stands dominated by Sitka spruce and western hemlock studied by researchers at the Smithsonian Institution and National Park Service. Fauna includes keystone species such as the brown bear (including populations on Admiralty Island National Monument), black bear, wolf, black-tailed deer, and marine mammals like humpback whale, orca, Steller sea lion, and harbor seal. Salmon species—Chinook salmon, sockeye salmon, coho salmon, pink salmon—drive trophic links supporting subsistence by Tlingit and commercial fisheries regulated by the National Marine Fisheries Service and Alaska Department of Fish and Game. Birdlife includes bald eagle, peregrine falcon, and migratory species recorded by the Audubon Society and avian research at the University of Alaska Southeast.

Human History and Indigenous Peoples

Indigenous presence by groups such as the Tlingit, Haida, and Tsimshian predates European contact, with traditions preserved in cultural centers like the Sealaska Heritage Institute and sites in Sitka National Historical Park. Contact events involved explorers Vitus Bering, Aleksandr Baranov linked to the Russian-American Company, and later American entities following the Alaska Purchase of 1867. Missions, trading posts, canneries, and the fur trade shaped colonial and American eras via players like the Hudson's Bay Company and entrepreneurs connected to the Klondike Gold Rush. Contemporary indigenous governance and corporations—Sealaska Corporation, Kootznoowoo Inc.—and legal frameworks from cases in the United States District Court for the District of Alaska influence land claims and resource management.

Economy and Transportation

Economic activities center on commercial fisheries, salmon and herring roe operations, timber historically managed within the Tongass National Forest, tourism driven by cruise lines such as Carnival Corporation and adventure outfitters, and small-scale mining linked to claims examined by the Bureau of Land Management. Transportation depends on marine routes including the Alaska Marine Highway System, floatplanes operated by companies like Alaska Seaplanes, helicopters, and regional air service at seaplane bases and airports in Ketchikan International Airport, Juneau International Airport, and Petersburg James A. Johnson Airport. Local economies interact with state agencies such as the Alaska Department of Transportation and Public Facilities and federal programs administered by the United States Department of Agriculture and National Oceanic and Atmospheric Administration.

Conservation and Protected Areas

Large portions fall within federal and state protections: Tongass National Forest, Admiralty Island National Monument, Glacier Bay National Park and Preserve borders, Karta River Wilderness Study Area designations, and marine protections influenced by Marine Protected Areas policies advocated by organizations like The Nature Conservancy and World Wildlife Fund. Management involves the United States Forest Service, National Park Service, Alaska Department of Natural Resources, and tribal governments coordinating stewardship, habitat restoration, and fisheries conservation under statutes and programs associated with the Endangered Species Act and regional management plans developed with input from entities such as the Southeast Alaska Regional Dive Fishery Management Organization.

Category:Archipelagoes of Alaska