Fort Cépérou was a fort that protected the city of Cayenne, French Guiana. It is named after Cépérou, a celebrated indigenous chief who ceded the land.The original wooden fort was built on a hill looking over the mouth of the Cayenne River in 1643. Over the years that followed the French temporarily lost the site to the Dutch, English and Portuguese. The fort was torn down and rebuilt several times.
Between 1689 and 1693 the whole town of Cayenne, including the fort, was surrounded by a classic line of fortifications by Vauban.
Wikipedia https://en.wikipedia.org/wiki/Fort_Cépérou
Coordinates 4°56'15.538" N -52°20'12.175" E