The Ottawa National Forest is a national forest that covers 993,010 acres in the Upper Peninsula of the U.S. state of Michigan. It includes much of Gogebic and Ontonagon counties, as well as slices of Iron, Houghton, Baraga, and Marquette counties. The forest is under the jurisdiction of the U.S. Forest Service. The headquarters are in Ironwood, Michigan, on the Wisconsin border, and the principal visitor center is located in Watersmeet, Michigan, in the southern section of the Forest.