In the same year as the Wilderness Act became law, the Bob Marshall Wilderness, located in Flathead and Lewis and Clark National Forests in Montana, was created. It had previously been set aside as the South Fork, Pentagon, and Sun River Primitive Areas in 1941. The area encompasses a million acres (4,000 km2) and is one of the best preserved ecosystems in the world. Known as "The Bob", it is the second largest wilderness in the contiguous 48 states. In compliance with the 1964 Wilderness Act, there is no motorized or mechanical equipment (including bicycles or hang gliders) permitted. Although camping and fishing are allowed with proper permit, no roads or buildings exist in the area, and logging and mining are prohibited. The Bob Marshall Wilderness Complex (which encompasses Bob Marshall, Scapegoat, and Great Bear Wildernesses) is a habitat for the grizzly bear, lynx, cougar, wolf, black bear, moose, elk and a variety of other birds, mammals, and plants.
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