The city lies 110 km off the Trans-Siberian railroad on the left bank of the Amur River, which has formed Russia's border with China since the 1858 Aigun Treaty and 1860 Treaty of Peking.
The city lies 110 km off the Trans-Siberian railroad, at the point where the Zeya River flows into the Amur. The Amur has formed Russia's border with China since the 1858 Aigun Treaty and 1860 Treaty of Peking.