The Dongjin Bridge or Jianchunmen Pontoon Bridge (Chinese: 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.