Fort Clinch, on the south side of the Cumberland Sound entrance at the north end of Amelia Island, is a State Park, museum, and recreation area. The old fort and a large red brick building near the inshore end of the south jetty are conspicuous. Camping facilities and a small-craft launching ramp are at the northwest end of the island on the east side of the channel to Fernandina Harbor. Fort Clinch State Park Aquatic Preserve, a Marine Protected Area (MPA), surrounds the State Park including portions of St. Marys River to the N, Amelia River to the W, and the Atlantic Ocean to the E.
The municipal marina is on the east side of Amelia River, about 2.3 miles southward of the channel entrance and 0.5 mile northward of Rayonier Wharf. Berthage with electricity, gasoline, diesel fuel, water, ice, marine supplies, pump-out, and a launching ramp are available.
Navigation:
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St. Marys Entrance and Cumberland Sound are 16 miles southward of St. Andrew Sound and 19 miles northward of St. Johns River. The sound is the approach to the city of Fernandina Beach
Fernandina Beach, the principal city on Cumberland Sound, is on the east bank of Amelia River, 2 miles south of the entrance. It is the shipping port for woodpulp and paper products. Some coastwise and foreign shipping serve the port. A large shrimp boat fleet operates out of Fernandina Beach.
A channel leads from inside the bar southward in Amelia River with a project depth of 36 feet to a turning basin; thence 35 feet through the turning basin; thence 28 feet to a turning basin off Rayonier Wharf, about 5.8 miles above the jetties.
The Intracoastal Waterway enters Cumberland Sound from the Cumberland River and continues through the Amelia River on the south.