"Truly the forkings and wanderings of the Nile are as unknowable as the streets of Cairo," said Dappa, blinking his eyes in amazement, "but Vrej found an Armenian coffee-trader, no more than five minutes’ walk from this place, who knew all about the way to Mocha. You go downstream to the great fork, and take the Damietta branch, and after a few miles there is a village on the right bank where a water-course strays off eastwards. In time that stream goes all the way to the Red Sea."