Hechuan (Chinese: 合川; pinyin: Héchuān) is a district in the northern part of Chongqing Municipality, People's Republic of China. Located at the meeting point of the Jialing, Fu and Qu rivers, it has a history of 1,500 years. Hechuan is 54 km (34 mi) away from downtown Chongqing's Yuzhong District.
Hechuan was formerly a county-level city but was incorporated into Chongqing as a district in 2006.
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The Diaoyucheng (simplified Chinese: 钓鱼城; traditional Chinese: 釣魚城; pinyin: Diàoyúchéng), or Diaoyu Fortress, is a fortress located on the Diaoyu Mountain in Hechuan District, Chongqing, across the Jialing River from the city center of Hechuan. It is known for its resistance to the Mongol armies in the latter half of the Song dynasty.
The siege of Diaoyucheng, alternatively the siege of Diaoyu Castle, was a battle between the Southern Song dynasty and the Mongol Empire in 1259. It occurred at the Diaoyu Fortress in modern-day Hechuan District, Chongqing, China. Möngke Khan, the fourth khagan of the Mongol Empire, lost his life in this battle, making it the only battle where the Mongols lost their khagan during their campaigns of conquest. This battle was preceded by the siege of Baghdad in 1258. The siege of Diaoyucheng was a setback for the Mongol conquest.