Castle_of_San_Luis_de_Bocachica
The Castle of San Luis de Bocachica, also called Fort St. Louis,[1] was a military fortress that defended Cartagena, Colombia. The Spanish built it in the 17th century. After it suffered war damage in the 18th century, they erected a new coastal fortification, the Castle of San Fernando on the same site.
The site on the Island of Tierra Bomba controlled deep-water access to Cartagena's harbour by the channel of Bocachica (or "small entrance" as opposed to Bocagrande, the "big entrance").