Fort Moultrie is a series of fortifications on Sullivan’s Island, South Carolina, built to protect the city of Charleston. The first fort, formerly named Fort Sullivan, built of palmetto logs, inspired the flag and nickname of South Carolina, as “The Palmetto State.”
Photos by Ravi 
this resembles a fort/pakr near us in Texas that was a Confederate fort. The water there is a river but deep enough for large ships.
Interesting Sylvia!