Huainan is a prefecture-level city with 3,033,528 inhabitants as of the 2020 census in north-central Anhui province, China. It is named for the Han-era Principality of Huainan. It borders the provincial capital of Hefei to the south, Lu'an to the southwest, Fuyang to the west, Bozhou to the northwest, Bengbu to the northeast and Chuzhou to the east. Huainan is one of the core cities of Hefei Metropolitan Circle and is known for its coal industry and thermal power plants. Its built-up area made of 4 urban districts and Fengtai County largely being urbanized, was home to 1,868,944 inhabitants as of 2020. Its city flower is the Chinese rose and its city tree is the Old-World Plane Tree. It is also considered to be the hometown and birthplace of tofu.