Boundary Trail (yellow) is a hiking trail in Littleton, Massachusetts. It is within Oak Hill Conservation Site. It is 3.2 miles long and begins at 320 feet altitude. Traveling the entire trail is 6.2 miles with a total elevation gain of 1,217 feet. The Lookout Rock viewpoint, the Tophet Swamp wetland, the Oak Hill Conservation Site conservation, and the Tophet Chasm valley can be seen along the trail. There are also an information board and parking along the trail.
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