I think what Bast was trying to say here was that China and India were too far away(well, maybe not India) to matter to the Greeks, who-even though they realized it existed-had never personally been there and only knew it through hearsay, and couldn't draw a map of China for their life (feel free to post an obscure map disproving this), and that China was only a little more important to the greeks than the river Oceanus and land of the Hesperides.