Stellwagen Bank National Marine Sanctuary is an 842-square-mile (638-square-nautical-mile) federally protected marine sanctuary located at the mouth of Massachusetts Bay, between Cape Cod and Cape Ann. It is known as an excellent whale watching site, and is home to many other species of marine life.
The sanctuary lies within Massachusetts Bay, 25 miles (40 km) east of Boston
, 5 miles (8.0 km) east of Gloucester
, and 5 miles (8.0 km) north of Provincetown
, Massachusetts.The heart of the sanctuary is Stellwagen Bank, an underwater plateau stretching 19 miles (31 km) north to south, and six miles (10 km) across at its widest, near the southern end.Possibly the most famous animals on Stellwagen Bank are the mammals. Five species of seals (harp, gray, harbor, hooded, and ringed), and numerous whale species swim in the waters of Stellwagen.
Whale watchers can frequently see humpback whales, Minke whales, fin whales and, one of the most critically endangered whale species, North Atlantic Right Whales. Several other whale species can also be seen here including the sperm whale, beluga, orca, pilot whale, white beaked dolphin, Atlantic white-sided dolphin, common dolphin, bottlenose dolphin, Risso’s dolphin, harbor porpoise, blue whale, and sei whale.The Sanctuary's headquarters is located in Scituate