Zheng Guo or Cheng Kuo (鄭國) was a hydraulic engineer from the ancient Chinese kingdom of Han who designed the Zhengguo Canal in the kingdom of Qin during the Warring States period. The canal remains to this day, despite having been constructed in the third century BC. The canal was originally designed as a method to trick the ruler of Qin so that Qin could not expand to the east. However, when it was completed, it was a great agricultural boost to the region.
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