The Bob Marshall Wilderness is a vast protected backcountry in western Montana along the Continental Divide, formally added to the National Wilderness Preservation System in 1964 but rooted in earlier primitive areas created in the 1930s and combined administratively in 1940. Named for forester and conservationist Bob Marshall, it reflects his roadless-land vision and now forms the core of the larger Bob Marshall Wilderness Complex. Spanning more than 1 million acres, it includes dramatic features such as the Chinese Wall, extensive forests, lakes, and waterfalls. Managed to remain roadless, it supports abundant wildlife and preserves one of the largest intact wild landscapes in the contiguous United States.