Rumney Marsh Reservation is a Massachusetts state park in Saugus and Revere that preserves more than 600 acres of salt marsh in the Saugus and Pines River estuary. Shaped by tidal water, this extensive wetland provides habitat for migratory birds and marine life, giving it important ecological value. It is also a place for low-impact outdoor recreation, especially birdwatching, along with non-motorized boating, fishing, walking, and hiking. The reservation is managed by the Massachusetts Department of Conservation and Recreation.