Cedariver is a 55-acre open space reserve along the Charles River in Millis, Massachusetts. Formerly called The Baker Reservation, it was given in 2004 by the family of Polly Baker to the land conservation nonprofit The Trustees of Reservations. The property combines farm fields, woodlots, and about a mile of river frontage, creating a diverse landscape in a compact setting. Its significance lies in preserving this stretch of riverfront land for low-impact public recreation, including hiking, picnicking, car-top boating, cross-country skiing, and other passive outdoor use, with access from a trailhead on Forest Road.