Is it necessary to isolate Beihai from Hepu?

No need. Beihai, alias Zhucheng, is a prefecture-level city in Guangxi Zhuang Autonomous Region. Hepu County belongs to Beihai City, Guangxi Zhuang Autonomous Region. As of August 23, 2022, according to the epidemic prevention policy of Beihai, Beihai is a low-risk area, and residents can enter and leave freely without isolation, just show their health codes.