Memoirs of a Revolutionist by Peter Kropotkin

All this summer I traveled on the Amúr. I went as far as its mouth, or rather its estuary -- Nikoláevsk -- to join the governor-general, whom I accompanied in a steamer up the Usurí and after that, in the autumn, I made a still more interesting journey up the Sungarí, to the very heart of Manchuria, as far as Ghirín (or Kirín, according to the southern pronunciation).

Many rivers in Asia are made by the junction of two equally important streams, so that it is difficult for the geographer to say which of the two is the main one, and which is a tributary. The Ingodá and the Onón join to make the Shilka; the Shilka and the Argúñ join to make the Amúr; and the Amúr joins the Sungarí to form that mighty stream which flows northeastward and enters the Pacific in the inhospitable latitudes of the Tartar strait.