A long time ago, this guy named Qin Shihuang had a similar dream to yours. And so as the first emperor of China (I think it was him), he decreed that a canal be built to divert water from the humid south to the arid north, though it didnt’ stretch as far to Shenzhen.
It was the biggest undertaking of its time, allowing the exception of some wall up north. And, it really didn’t work.
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