Snake Island (Massachusetts)

It is named for its serpentine shape, and has a permanent size of 3 acres (12,000 m2), and rises to a height of 10 feet (3.0 m) above sea level.

[1] Since the 18th century the island has been owned by variety of owners, and has been used for livestock grazing, and as a squatter camp occupied by lobstermen and clammers.

Unique among the Boston Harbor Islands, it has an interior lagoon which fills and partly drains, with the tide.

The water entrance to the lagoon is winding and only six feet wide, not navigable for even a canoe or kayak, except at an unusually high tide.

In recent years the island has increased in area, due to shoaling of the surrounding water, especially to the west; its long "tail" is now fully exposed at low tide.