Cedariver, formerly known as The Baker Reservation, is a 55-acre (22 ha) open space reserve located on the Charles River in Millis, Massachusetts. The property, acquired in 2004 by the land conservation non-profit organization The Trustees of Reservations, includes farm fields, woodlots, and 1-mile (1.6 km) of river frontage.[1] 
Cedariver is open to hiking, picnicking, car-top boating, cross country skiing, and other passive pursuits. A trailhead is located on Forest Road in Millis. The property was a 2004 gift of the family of Polly Baker.[2] 
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 | Wildlife sanctuaries
 |  Billingsgate IslandCarr IslandE. Howe ForbushEgg Rock Grace A. RobsonJ.C. PhillipsKnightPenikese Island Ram Island (Mattapoisett)Ram Island (Salisbury)Susan B. MinnsTarpaulin CoveWatatic Mountain
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 |  Black Pond BogBoat MeadowFrancis Newhall WoodsGrassy PondGreene SwampHalfway Pond IslandHawley BogHockomock SwampHoft FarmHomer-WatchaKatama PlainsMcElwain-OlsenMiacomet MoorsReed BrookRoger and Virginia DrurySandy NeckDavid H. Smith Preserve and Fire TrailStacy MountainTatkon
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42°09′27″N 71°20′06″W / 42.1576°N 71.3351°W / 42.1576; -71.3351