The Quabbin Valley is a region of Massachusetts in the United States. The region consists of the Quabbin Reservoir and accompanying river systems[which?] in Franklin, Hampden, Hampshire, and Worcester counties. The area is sometimes known as the Swift River Valley region, a reference to the Swift River, which was dammed to form the reservoir.
Upon the construction of the Quabbin Reservoir, four towns in the valley were officially disincorporated, their area absorbed by surrounding municipalities. These towns are Dana, Enfield, Greenwich, and Prescott.
Many people living in those towns fought unsuccessfully to prevent construction of the reservoir, arguing that it was unfair to move the Swift River Valley inhabitants to provide drinking water for Boston residents, and the movement has become a part of Western Massachusetts folklore.