The Treaty of Aigun (Russian: Айгунский договор; ) was an 1858 unequal treaty between the Russian Empire, and the empire of the Qing Dynasty, the Manchu rulers of China, that established much of the modern border between the Russian Far East and Manchuria (the original homeland of the Manchu people and the Qing Dynasty), which is now known as Northeast China. It reversed the Treaty of Nerchinsk (1689) by transferring the land between the Stanovoy Mountains and the Amur River from China (Qing Empire) to the Russian Empire. Russia received over from China.