The Bermuda Triangle.
It is situated in the Atlantic Ocean.It is bounded with Florida,Bermuda and puerto Rico.It is said that many persons who went inside this triangle had not come back,whether it be a airplane or a ship.They are many studies that have shown that this is because of some scientific reasons but there are also very myths like aliens took the persons for their experiments from here or there may be sea monsters present in it.This triangle is really very mysterious.
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