Travel and transportation
The Iron Gate gorge that impeded traffic on the Danube. When Trajan invaded Dacia in 101, he cut a canal that made navigation safe.
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A spillway of the Lingqu, a canal built by the First Emperor around 215 BCE. Still in use, it links the River Xiang and River Lim thus connecting two drainage systems and creating a navigable network covering central and southern China.
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