So the Bermuda Triangle is better known for its ships sunk by war then by supernatural forces.
The Bermuda Triangle starts at Miami and I think is north of the Florida Keys so idk if we could call this region the Bermuda triangle. Instead it could be a legend about a mythical island out in the ocean but to get there you have to cross a treacherous ocean. I think it's important to remember that most medieval sailors didn't travel very far from land. Southern Florida and the Bahamas and the Cuban north Coast would definitely be hotspots in wars but very prosperous in peacetime