Stellwagen Bank
geographical name
Stell·wag·en Bank ˈstel-ˌwa-gən 
underwater ridge 19 miles (30.5 kilometers) long by 6 miles (9.5 kilometers) wide in the Atlantic at the entrance to Massachusetts Bay
Note: An area of rich biodiversity, Stellwagen Bank has been set aside as an 842 square mile (2181 square kilometer) national marine sanctuary.