The Amur and Poronai Rivers in the Russian Far East49.8N 143.1E
The main body of land on the left belongs to Russia, as does the section of Sakhalin Island extending downward from the top center. The island below is Hokkaido, belong to Japan. A small portion of Japan’s main island, Honshu, is visible just below Honshu, at the very bottom.
The wide river carrying dark brown sediments on the Russian mainland is the Amur. The main rivers on Sakhalin island are the Tym and the Poronai. The latter flows south-south-east to the Gulf of Patience or Shichiro Bay, on the south-east coast.
In the full image, a reddish brown lake can be seen near the mouth of the Poronai and the shores of the gulf. Further down, three other small streams enter the wide semicircular Gulf of Aniva or Higashifushimi Bay at the southern extremity of the island.