Aigun (simplified Chinese: 瑷珲; traditional Chinese: 璦琿; pinyin: Ài Hún; Manchu: ᠠᡳ᠌ᡥᡡᠨ aihūn; Russian: Айгунь, romanized: Aigun) was a historic Chinese town in northern Manchuria, situated on the right bank of the Amur River, some 30 kilometres (19 mi) south (downstream) from the central urban area of Heihe (which is across the Amur from the mouth of the Zeya River and Blagoveschensk).

[8] Aigun, however, remained the seat of the Deputy Lieutenant-General (Fu dutong), responsible for a large district covering much of the Amur Valley within the province of Heilongjiang as it existed in those days.

As a part of a nationwide Sino-French cartographic program, Aigun (or, rather, Saghalien Ula hoton) was visited ca.

Surrounded by numerous villages on the fertile riverside plain, the town was well provisioned with foodstuffs.

[10] During the Boxer Rebellion of 1900, for a few weeks Aigun was the center of military action directed against the Russians.

The Manchus of the Chinese capital Peking (now known as Beijing) were influenced by the Chinese dialect spoken in the area to the point where pronouncing Manchu sounds was hard for them, and they pronounced Manchu according to Chinese phonetics, while in contrast, the Manchus of Aigun could both pronounce Manchu sounds properly and mimick the sinicised pronunciation of Peking Manchus, since they learned the Pekinese pronunciation from either studying in Peking or from officials sent to Aigun from the capital, and they could tell them apart, using the Chinese influenced Pekinese pronunciation when demonstrating that they were better educated or their superior stature in society.