Huainan Huaibei refers to what place?

Huai River refers to Huai River.

If it refers to the interior of Anhui Province, it is generally said to be south of Huaihe River and north of Huaihe River. That's what the weather forecast says

"From today's night to tomorrow's day, there will be small to moderate rain in the north of Huaihe River, moderate rain between Jianghuai and parts of Jiangnan, and short-term heavy rain to heavy rain."

Answer supplement:

Hello, there is such a teacher in Anhui Province, but it's not called this anymore. In ancient times, "the orange in Huainan is orange", which refers to the south of Huaihe River.