A portion of the 11,000-acre Mt. Greylock State Reservation occupies the southeast corner of Williamstown. The primary trails onto the property are the Hopper Trail (reached from Hopper Road) and the Roaring Brook Trail (from Roaring Brook Road). The summits of Stoney Ledge (2,560 feet) and Mt. Prospect (2,690 feet) are located near Williamstown.
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