There is more than one city nearest to Zhengzhou, Henan. The nearest cities in the north of Zhengzhou are Xinxiang and Jiaozuo. These two cities face Zhengzhou across the river. The nearest city to the east of Zhengzhou is Kaifeng, the nearest city to the south of Zhengzhou is Xuchang and the nearest city to the west of Zhengzhou is Luoyang. Zhengzhou, called Shangdu in ancient times, is the capital of Henan Province, a megacity and the core city of Central Plains urban agglomeration. The State Council approved an important central city in central China and an important national comprehensive transportation hub with a total area of 7,446 square kilometers. Zhengzhou is an important hub city of railway, aviation, electric power, postal service and telecommunication in China, and has the largest freight marshalling station in Asia. Zhengzhou Airport Port Area is the only comprehensive experimental area of national airport economy in China, and Zhengzhou Commodity Exchange is the first futures exchange in China. Zhengzhou is located in the middle of China, the lower reaches of the Yellow River, the hinterland of the Central Plains and the middle of Henan Province. Located in the middle and lower reaches of the Yellow River and the transition zone from the northeast wing of Funiu Mountain Range to Huanghuai Plain, the terrain is high in the west and low in the east, high in the middle and low in the northeast or southeast. It belongs to the continental monsoon climate in the north temperate zone with four distinct seasons.