The inhabitants are mentioned in the official works of the Yuan dynasty as Tung fan or eastern barbarians; and under the Ming dynasty the island begins to appear as Kilung.
From Chieng Khan the river again turns eastwards along the 18th parallel, forcing its way through its most serious rapid-barrier, and receiving some important tributaries from the highlands of Tung Chieng Kum and Chieng Kwang, the finest country in Indo-China.
By these ranges it is forced due south for 500 m., forming the boundary between the provinces of Shansi and Shensi, until it finds an outlet eastwards at Tung Kwan - a pass which for centuries has been renowned as the gate of Asia, being indeed the sole commercial passage between central China and the West.
At Tung Kwan the river is joined by its only considerable affluent in China proper, the Wei (Wei-ho), which drains the large province of Shensi, and the combined volume of water continues its way at first east and then northeast across the great plain to the sea.
He received considerable assistance and encouragement in Japan, where he founded a society known as the Tung Men-hui, which played a prominent part in Chinese politics after the establishment of the Republic. Although an exile, he was generally regarded by the " Western-learning " section of Young China as its leader, especially after the Chinese Government's attempt to kidnap him in London, in 1896.