The Boundary Waters Canoe Area Wilderness (BWCAW or BWCA), is a wilderness area within the Superior National Forest in northeastern Minnesota (United States) under the administration of the U.S. Forest Service. A mixture of north woods forests and glacial lakes and streams, the BWCAW's preservation as a primitive wilderness began in the 1900s and culminated in the Boundary Waters Canoe Area Wilderness Act of 1978. It is a popular destination for both canoeing and fishing on its many lakes and is the most visited wilderness in the United States.