The Medfield Rhododendrons is a 196-acre (0.79 km2) nature reserve established in 1934 in Medfield, Massachusetts managed by the Trustees of Reservations.  The site contains the largest area of Rhododendron maximum in the state, which are currently listed as threatened by the Massachusetts Natural Heritage and Endangered Species Program due to over-collecting.[1] 
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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°10′35″N 71°18′20″W / 42.1764°N 71.3055°W / 42.1764; -71.3055