The Fort Clinch State Park is a Florida State Park, located on a peninsula near the northernmost point of Amelia Island, along the Amelia River. Its 1,100 acres (4 km2) include the 19th-century Fort Clinch, sand dunes, plains, maritime hammock and estuarine tidal marsh. The park and fort lie to the northeast of Fernandina Beach at the entrance to the Cumberland Sound.