What does Huaichuan mean in Huaichuan Nighttalk?

Huaichuan refers to Jiaozuo, Qinyang, Aibo, wen county, Mengxian, Wuzhi, Xiuwu and other cities and counties in Henan today. During the Ming and Qing Dynasties, it was under the jurisdiction of Huaiqing Government. Because of its open terrain, Ma Pingchuan was commonly known as Huaichuan.

Fog is another name for fog city. London, Edinburgh, China, Chongqing, Tokyo, San Francisco and Ankara are the six famous fog capitals in the world.

For reference only, because the information you gave is not very large, I can only help you here.