Mallows Bay Eco 4 is a 0.57-kilometer trail located in Nanjemoy, Maryland, with a gentle elevation gain of 6.3 meters along the Potomac River shoreline. The trail provides exceptional views of the famous "Ghost Fleet" of WWI-era shipwrecks and access to one of the largest ship graveyards in the Western Hemisphere, while offering opportunities to observe diverse wetland wildlife and maritime history.