Monomoy Island

Monomoy Island is an 8-mile-long (13-kilometre) spit of sand extending southwest from Chatham, Cape Cod off the Massachusetts mainland.

During the early 19th century, a deep natural harbor at Monomoy's inner shore known as the Powder Hole attracted a sizeable fishing settlement.

The island was designated a Federal Wildlife Refuge in 1970, serving as an important stop on the migratory routes of 285 species of birds.

Since gaining federal protection in 1972, gray seals have become a common sight on Monomoy and nearby Chatham's South Beach island.

The wooden lightkeeper's quarters, the cast iron light tower, and the brick generator house are on the point of South Monomoy.

The former gunnery and bombing range was surveyed under the United States Army Corps of Engineers Formerly Used Defense Sites (FUDS) program for possible unexploded ordnance in 1995.