Even among the tributaries of the two great rivers of China, many rivers may be found of considerable length, and some scarcely inferior to the largest rivers of Europe. At the head of these are the Han-shwuy, which, rising in the mountains between Shense and Kansuh, empties itself into the Yang-tsze-keang at Han-yang-Foo, in Hoopih,—and the Ya-lung-keang, which rises in Kokonor, and after running for some time nearly parallel with the Yang-tsze-keang, empties itself into that river on the borders of Szechuen and Kansuh.]