Mallows Bay on the tidal Potomac River in Maryland is home to nearly 200 known shipwrecks spanning from the Revolutionary War through the present, and including the remains of the largest “Ghost Fleet” of World War I wooden steamships built for the U.S. Emergency Fleet, which are listed on the National Register of Historic Places. Mallows Bay is a largely undeveloped landscape and waterscape identified as one of the most ecologically valuable in Maryland, as the ship remains provide important habitat for fish and wildlife, including rare, threatened and endangered species.