The Roaring Forties is the term for a band of prevailing strong westerlies that lie between about 40 and 50 degrees south. In the age of sail they were used by mariners on westward voyages across the Indian Ocean (mainly Dutch to the East Indies and British to Australia – and the Pacific Ocean (back to Europe via way of Cape Horn from Australia - New Zealand.)
I live in the bloody things! I don't need a citation. Just believe me.
See also:Trade winds.