One of Asia's mightiest rivers, the Amur is also the most elusive. The terrain it crosses is legendarily difficult to traverse. Near the river's source, Ziegler travels on horseback from the Mongolian steppe into the taiga, and later he is forced by the rivers impassability to take the Trans-Siberian Railway through the four-hundred-mile valley of water meadows inland. As he voyages deeper into the Amur wilderness, Ziegler also journeys into the history of the peoples and cultures the rivers path has transformed.