|Basin countries||United States|
|Surface area||353 acres (143 ha)|
|Average depth||13 ft (4.0 m)|
|Max. depth||45 ft (14 m)|
Lake Massapoag is the headwater of the Canoe River, which flows south to join the Taunton River and empty into Narragansett Bay. It is also the headwaters of the Massapoag brook, which flows into the Neponset River.
Lake Massapoag was the site of a large 19th-century ice business, with an enormous wooden icehouse at the eastern end of the lake.
Because of the lake and the fact that Sharon is at a slightly higher elevation than the surrounding towns, and because it is located on the main rail line going south from Boston, the shores of the lake developed into a minor summer resort with several large hotels, summer camps and cottage colonies. Temple Adath Sharon was built as a summer synagogue, and the houses around it, now occupied year-round, were once summer cottages.
The site of the former ice house is now a large town beach. The beach was created by trucking in quantities of sand after the ice house burned down.
The lake is also popular for sailing and sailboarding. The Wheaton College Sailing Team, Sharon High School Sailing Team, and Dover Sherborn High School Sailing Team train on Lake Massapoag.