Tewksbury Rock (Massachusetts)

Tewksbury Rock is a small, subsurface rock pinnacle located in Massachusetts Bay, within the city limits of Boston. The rock is northeast of Outer Brewster Island, west of Martin Ledge, south east of Green Island and far north of Boston Ledge. It is 15 feet (4.6 m) to 18 feet (5.5 m) below the surface of the water, but more than 45 feet (14 m) above the hard gravel floor of the bay.

Map of Tewksbury Rock, Massachusetts, USA