Main Fen Trail is a hiking trail in Lake in the Hills, Illinois. It is within Barbara Key Park and Illinois Department of Natural Resources. It is 0.2 miles long and begins at 821 feet altitude. Traveling the entire trail is 0.4 miles with a total elevation gain of 43 feet. The trail ends near the Mulberry, Mulberry, and Mulberry trees and the Dome Hill Observation Deck viewpoint. There are also an information map and a bench near the end of the trail.
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