The city zone is centrally located, on both sides of Jiyun River.
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Much of the areas electric power is generated from Solar energy, while there is also widespread use of oil resources and geothermal power, which has been heavily exploited.
"Hangu" is also the name of a place in China, and since many Chinese travelers have passed through the area for centuries, it's possible that travelers, like Hiuen Tsang, saw some similarities with their own region and thus named it Hangu.
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Starting from November 2009, Binhai New Area was consolidated into a district, and the former subordinate districts of Tanggu, Hangu and Dagang were abolished.