Middlesex Fells Reservation

Middlesex Fells Reservation, often referred to simply as the Fells, is a public recreation area covering more than 2,200 acres (890 ha) in Malden, Medford, Melrose, Stoneham, and Winchester, Massachusetts, United States. The state park surrounds two inactive reservoirs, Spot Pond and the Fells Reservoir, and the three active reservoirs (North, Middle, and South) that are part of the water supply system for the town of Winchester.

Source: Wikipedia — Middlesex Fells Reservation (CC BY-SA 4.0)