Old growth red and white pines tower above you along this one-mile self-guided interpretive trail. There is a very short loop trail and a long one mile US Forest Service Trail.
Lost 40 Scientific and Natural Area owes its name to a surveying slip back in 1882. This site includes a narrow peninsula extending from a large upland esker (a glacial landform). The peninsula is flanked by a black spruce and tamarack bog on one side, and a willow and alder marsh on the other.
The area contains 30 acres of white pine-red pine forest and 20 acres of spruce-fir forest. The virgin old-growth white pine-red pine forest is considered to be the most significant old-growth white pine-red pine stand outside of the Boundary Waters and Itasca State Park. Red pine 240-250 years old can be found on the site. Minnesota's state red pine "Big Tree Champion" is found here and is 120 feet tall with a circumference of 115 inches.