Travels Of Marco Polo: Forty Eight

Twenty miles westward from that castle is a river called Kara-moran. [1] It is very long and broad and there is no bridge over it. It flows on to the ocean.  On its banks are many many cities and castles, likewise many merchants and manufactured goods, and in the country around, ginger grows in great abundance.  The number of birds is wonderful, so that for a Venitian grosso one can buy three pheasants, and after travelling three days you find a noble city named Ca-cian-fu. [ 2] The people are idolators as that of Cathay.  It is a city of great merchandise and many arts. They have abundance of silk with cloth of gold of all fashions.  I will go on to tell you of the capital of the kingdom.

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1. Karakorum is a mountain range. It is not known Black river in China has any connection with Karakorum mountain range. As per the footnote it is Black river.  The source of Black River is Yunnan province in China. 

2. Probably it is Tongchuan