Admiralty Island National Monument is located on Admiralty Island in Southeast Alaska. It was created December 1, 1978, and covers 955,747 acres (3,868 km²) of Tongass National Forest in the Panhandle of southeast Alaska. The remoteness of the monument led Congress to pass legislation designating all but 18,351 acres (74 km²) of the monument as the Kootznoowoo Wilderness, ensuring that the vast bulk of this monument will be permanently protected from development. The monument is administered by the U.S. Forest Service, an agency within the U.S. Department of Agriculture.
Western Hemlock, Sitka Spruce and Western Redcedar dominate the prolific rainforest vegetation; wildlife in abundance includes brown bear, bald eagles, many species of salmon, whales, and deer. It has more brown bears than the entire lower 48 states, and one of the highest densities of bald eagles in the World.
The Greens Creek Mine is an underground silver, gold, zinc and lead mine located on the northwest end of the island, within the national monument. It began operation in 1989. Acid mine drainage has occurred at the mine site.