The Quabbin Reservoir is a large water supply reservoir located in central Massachusetts. It was created in the 1930s by damming the Swift River to provide drinking water for the city of Boston and surrounding communities. The reservoir covers approximately 39 square miles and holds about 412 billion gallons of water. Surrounded by a scenic landscape, the Quabbin is also a popular destination for outdoor activities such as hiking, fishing, and birdwatching. The area is home to diverse wildlife and offers beautiful views of the surrounding hills and forests, making it a valuable natural resource and recreational site.