Mallows Bay

Mallows Bay is a small bay on the Maryland side of the Potomac River in Charles County, Maryland, United States. The bay is the location of what is regarded as the "largest shipwreck fleet in the Western Hemisphere" and is described as a "ship graveyard."

Mallows Bay was declared a National Marine Sanctuary on September 9, 2019.

Ghost fleet
The "Ghost Fleet" of Mallows Bay is a reference to the hundreds of ships whose remains still rest in its relatively shallow waters. In total, 230 United States Shipping Board Merchant Fleet Corporation ships are sunken in the river. More than 100 of the vessels are wooden steamships, part of a fleet built to cross the Atlantic during World War I. Because they were built of wood due to a lack of available steel, most of these ships were obsolete upon completion after the end of the war.

The U.S. Navy did not want the ships, which were stored in the James River – at the cost of $50,000 a month – so they were sold to the Western Marine & Salvage Company. The company moved the ships to the Potomac River at Widewater, Virginia and in 1925, they were towed to Mallows Bay. Western Marine went bankrupt and the ships were burned and remained where they lay. During World War II, Bethlehem Steel built a salvage basin to recover metal from the abandoned ships. Wrecks of various civilian boats are also present at the site.

Access to the ships is through Mallows Bay Park, operated by the county, located at 1440 Wilson Landing Road in Nanjemoy, Maryland. A 0.8 mi trail loops around the park and the salvage basin. In 2010, a boat ramp and pier for recreational use was constructed to provide access to the Potomac River. It is popular to canoe or kayak among the ship ruins; the ships form a reef that hosts an array of wildlife.

The bay was listed as an archaeological and historic district on the National Register of Historic Places in 2015, and was declared a National Marine Sanctuary in September 2019.

Among the most prominent ships seen at Mallows Bay is the S.S. Accomac.