The Dongjin Bridge (simplified Chinese: 东津桥; traditional Chinese: 東津橋; pinyin: Dōngjīn Qiáo) or Jianchunmen Pontoon Bridge (建春门浮桥) in Ganzhou, Jiangxi province, China is a pontoon bridge constructed over the Gong River in the Chinese Song dynasty (960–1279).^[1] Situated outside the Jianchunmen gate of the Ganzhou city wall, it is the survivor of several pontoon bridges found in China.

Its length is a total of roughly 400 metres long, made up of wooden planks placed on around 100 wooden boats^[2] linked together with iron chains.