The Graves is an aggregation of rock outcroppings in Massachusetts Bay, Massachusetts, United States. Situated some 11 miles (18 km) offshore of downtown Boston, it is the outermost island in the Boston Harbor Islands National Recreation Area. It is the location of The Graves Light, at 113 feet (34 m) tall the tallest lighthouse in Boston Harbor, and an important navigation aid for traffic to and from the port. The island has a permanent size of 1.8 acres, and rises to a height of 15 feet (4.6 m) above sea level; there is only aquatic vegetation on the island.