As to the fable that there are Antipodes, that is to say, men on the opposite side of the earth where the sun rises when it sets to us, men who walk with their feet opposite ours, that is on no ground credible. Even if some unknown landmass is there, and not just ocean, there was only one pair of original ancestors, and it is inconceivable that such distant regions should have been peopled by Adam's descendants.
The Works of Aurelius Augustine: A New Translation (ed. 1871)