Farther west are found the "Jack-Jacks" and the "Kwa-Kwas," sobriquets given respectively to the Aradian and Avikom by the early European traders.
The Kwa-Kwa are said to be so called because their salutation "resembles the cry of a duck."
In the older books of travel are often found the alternative names for this region, Tooth Coast (Cate des Dents) or Kwa-Kwa Coast, and, less frequently, the Coast of the Five and Six Stripes (alluding to a kind of cotton fabric in favour with the natives).
The "master of the law," as his biographers call him, plunged alone into the terrible desert of the Gobi, then known as the Sha-mo or "Sand River," between Kwa-chow and Igu (now Hami or Kamil).
This time, however, he crosses Pamir, of which he gives a remarkable account, and passes by Kashgar, Khotan (Kustana), and the vicinity of Lop-nor across the desert to Kwa-chow, whence he had made his venturous and lonely plunge into the waste fifteen years before.