Confluence of the Ussuri and Amur Rivers, Russia and China – May 31st, 201048.4N 135.0E
The Ussuri River, visible by the right edge of this orthorectified image, forms for a considerable distance the boundary between China (Heilongjiang Province, visible here to the left) and Russia (Siberia, visible here to the right).
It is a northward-flowing tributary of the Amur River; the two rivers’ confluence is visible beyond the hills in the upper right corner. The Ussuri’s length from the source of the Ulakhe is 565 miles (909 km), and its basin is 72,200 square miles (187,000 square km) in area.
The Ussuri is formed by the confluence of the Sungacha (Song’acha) River, the outlet of Lake Khanka (Xingkai); and the Ulakhe and Arsenyevka rivers, both of which rise on the southwestern slopes of the Sikhote-Alin mountain complex.