Roaring Forties

The Roaring Forties is a name given, especially by sailors, to the latitudes between 40°S and 50°S, so called because of the boisterous and prevailing westerly winds. Because there is less landmass to slow them down, the winds are especially strong on the Southern Hemisphere, notably in the South Indian Ocean, which is now incorporated into what is known as the Southern Ocean
See more at Wikipedia.org...