Delirium Wilderness is a 11870 acre wilderness area in Chippewa County, within the Hiawatha National Forest in the U.S. state of Michigan. The wilderness is forested and flat-to-rolling, with its lower reaches often characterized as a swamp. Elevations range from 590 to 890 feet (180 to 270 m). Sculpted by glaciers and an ancient glacial lake, it now contains the 80 acre Sylvester Pond and the 6 acre Delirium Pond, as well as parts of the headwaters of the Pine and Waiska Rivers.

Vegetation

Delirium Wilderness is thickly forested with swamp conifer, aspen, and white cedar, with stands of red and jack pine growing in its drier areas.

Wildlife

Wildlife predominant in the Delirium Wilderness includes beaver, bobcat, otter, wolf, various species of duck, loon, great blue heron, and sandhill crane. Whitetail deer, black bear, and rabbit are also found in the area.