The area of the earth between 50 and 60 degrees south, prone to strong winds.
1998, Derek Lundy, chapter 1, in Godforsaken Sea: Racing the World's Most Dangerous Waters, page 5:
Its official demarcation is forty degrees south latitude. It includes the latitudes sailors long-ago nicknamed the roaring forties, the furious fifties, and the screaming sixties. It's an area of almost constant high wind and frequent gales, often exceeding hurricane strength.