The National Development and Reform Commission said in an online statement on Monday that the plan will span nine projects that total 1,100 km (683 miles) long.
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These projects will be built over the years to 2020, and are part of a wider plan that will stretch to 2030, it said.
The current population of the three areas is estimated at around 110 million, and by the time it's complete, the so-called Jing-Jin-Ji project will span 212,000 sq km (82,000 sq miles), or more than twice the size of South Korea.
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