(Massachusetts)
Belle Isle Marsh Reservation in East Boston, Suffolk County, Massachusetts is an urban nature preserve and public recreation area containing mostly coastal wetlands. The 350-acre (1.4 km2) Reservation includes the largest remaining salt marsh in the Boston area. The marsh also borders the towns of Revere and Winthrop. (Ref: https://en.wikipedia.org/wiki/Belle_Isle_Marsh_Reservation)