*****'s Triangle (1975)
A US coast guard finds only a woman still alive aboard a shipwreck. She tells her rescuer what happened and soon, they find themselves trapped in a mysterious part of the ocean known as *****'s Triangle.
The entire movie seems like random guy explaining his big ah-ha I solved the murder and here's how it was done! exposition to the only survivor, but then there's actually a reason this was called *****'s Triangle and not Bermuda or Devil. It's not a great payoff, but in terms of Bermuda Triangle movies it's a half-way decent one?
(also, Mary 2019! I already suggested, but go read the blurb ;) )
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tsarstepan commented
Beelzebub's Triangle (1975)? Mephistopheles' Triangle (1975)? O-Yama's Triangle (1975)?
In case someone wants to look it up.
https://www.imdb.com/title/tt0073662/reference -
Anonymous commented
Really surprise that word got edited. Synonym for the devil! Nothing x-rated ;)