I think John Thorton's answer to this in "Africa and Africans in the Making of the Atlantic World, 1400-1800" also applies here
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His answer was that there was a strong current going South-West along the West African coast, but not much knowledge of return currents
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Basically, if you were dependent on sails, there was a point of no return on the journey South and return journeys had to be by land
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I'd be curious if Dr. Green agrees it also applies to the Roman world
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Replying to @ASPertierra @ticiaverveer
Fwiw, this is my understanding, though the earlier Hanno the Navigator obviously got a long way down the coast, it seems :)
12:31 PM - 7 Oct 2017
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