AIGUN  , or AIHuN (also Sakhalyan-ula-khoto), a

town of China, province Hei-lung-kiang, in northern Manchuria, situated on the right bank of the Amur, in a fertile and populous region, 20 M. below Blagovyeshchensk, where it occupies nearly 2 M. on the bank of the river . There is a palisaded fort in the middle of the town, inside of which is the house of the fu-tu (governor) . Its merchants carry on an active local trade in grain, mustard, oil and tobacco, and some of its firms supply the Russian administration with grain and flour . During the " Boxer " rising of 1900 it was, for a few weeks, the centre of military action directed against the Russians . The population, of some 20,000, includes a few hundred Mussulmans . The town was founded first on the left bank of the Amur, below the mouth of the Zeya, but was abandoned, and the present town was founded in 1684 . It was here that Count Muraviev concluded, in May 1857, the Aihun treaty, according to which the left bank of the Amur was conceded to Russia .