Kian-suy River, China (Google Maps ⧉, OpenStreetMap ⧉)

"catch a great quantity of fish. It is a good half mile wide, and very deep withal, and so long that it reaches all the way to the Ocean Sea,—a very long way, equal to 80 or 100 days’ journey. And the name of the River is Kian-suy. The multitude of vessels that navigate this river is so vast, that no one who should read or hear the tale would believe it."