Yanbu', or Yembo. See Medina. Yandun, a town of Thongwa, Burma, in the delta of the Irawadi. Pop. 20,235, Yang-tsze-kiang (better simply Kiang or Chiang), the longest and most important of Chinese rivers, affording a waterway, not unbroken by rocks and rapids, across the breadth of China, rises in the mountains of Tibet, where its sources were explored by Prejevalsky in 1884-85, and after a course of 3200 miles (SE., NE., and E.), reaches the sea by a wide estuary which begins 50 miles below Nanking, and may be held to terminate near Shanghai. On its banks are also Chin-kiang, Ngan-king, Hankow, Wu-chang, Ichang, and Chung-king (opened to European commerce by treaty in 1890). Some of its many tributaries are over 1000 miles long; its basin is estimated at 689,000 sq. m. Its importance for commerce is enormous, though the navigation is in places difficult even for the native boats, which have to be shoved and poled through the narrow gorges against a strong current. Steamers run in the lower parts. See Little's Through the Yang-tse Gorges (1888).