Broad Sound is a bay on the Massachusetts coast north of Boston. It lies on the west of Massachusetts Bay, between Nahant and Deer Island; Lynn harbor is at its north end. The main channel of Boston Harbor empties into the sound.

• Massachusetts Bay (Map). 1:80,000. NOAA. 2011. Chart 13267.

42.40°N 70.95°W / 42.40; -70.95 (Broad Sound)

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