Shanghai

The tallest skyscraper in China is located in Shanghai.

An excerpt from the article 30 facts about Shanghai
The Shanghai Tower, which is 632 meters high, was opened in 2017. Currently, it is the third tallest building in the world, surpassed by Burj Khalifa in Dubai, and Merdeka 118 in Malaysia. It has the world’s highest observation deck, located at 562 meters.