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The World Conservation Union (IUCN) classifies wilderness at two levels, Ia (Strict Nature Preserves) and Ib (Wilderness areas).
Most scientists and conservationists agree that there is no place on earth that is completely untouched by humanity, either due to past occupation by indigenous people, or through global processes such as climate change. Activities on the margins of specific wilderness areas, such as fire suppression and the interruption of animal migration also affect the interior of wildernesses.
In the United States, a wilderness area is an area within federal lands which is set aside by statute as a nature preserve. Human activities in wilderness areas are restricted to scientific study, hiking and camping; horses are permitted but motorized vehicles and equipment are not.
The National Wilderness Preservation System coordinates the wilderness activities of four federal agencies - Bureau of Land Management, U.S. Forest Service, National Park Service and the U.S. Fish and Wildlife Service. Wilderness areas are parts of national parks, wildlife refuges, national forests and may include land in several diferent units managed by different agencies. There are 662 wilderness areas in the U.S., preserving 105 million acres ( 430,000 km2). This is approximately five percent of the entire United States. Wilderness areas exist in 44 of the 50 states.
Most U.S. wilderness areas are in National Forests but the largest amount of wilderness land is administered by the National Park Service. The largest contiguous wilderness complex in the United States is the Noatak and Gates of the Arctic Wilderness es in AlaskaOn January 3, 1959, Alaska was admitted to the United States as the 49th state. The population of the state is 626,932, as of 2000. The name "Alaska" is most likely derived from the Aleut word for "great country" or "mainland. The natives called it "Alyes at 12,743,329 acres (51,570 km); the largest wilderness area outside Alaska is the Frank Church-River of No Return Wilderness Area in central IdahoIdaho ( In Detail) (Full size) State nickname: Gem State Other U. States Capital Boise Largest City Boise Governor Dirk Kempthorne Area Total Land Water % water Ranked 14th 216,632 kmē214,499 kmē 2,133 kmē1% Population Total ( 2000) Density Ranked 39th1,2.