Rattlesnake Gutter in Leverett, Massachusetts, is a scenic, boulder-filled chasm in Franklin County, better understood as a narrow rocky cleft than a simple valley. About 3/4 mile long and 1/8 mile wide, it is valued for both its geology and its role as ecological habitat. Its origin remains uncertain, adding to its significance, with possible explanations including a subglacial meltwater channel, movement along an old geologic fault, or a spillway from a temporary proglacial lake. The area is protected through conservation stewardship, and the Metacomet-Monadnock Trail passes nearby, making it a notable natural feature along the route.