Tolland State Forest is a publicly owned forest with recreational features covering 4,415 acres (1,787 ha) in the towns of Otis, Tolland, Blandford and Sandisfield in the southern Berkshire Hills of Massachusetts. The state forest centers on the 1,065-acre (431 ha) Otis Reservoir, the largest body of water for recreational use in western Massachusetts. The forest is managed by the Department of Conservation and Recreation.