The area around Dengzhou City, Nanyang City, Henan Province, China. Yuhuaifu yam vermicelli is a kind of vermicelli made from yam as the main raw material. It is mainly produced in Dengzhou City, Nanyang City, Henan Province, China. Dengzhou City is located in the mountainous area of ??southern Henan. It has fertile land and a suitable climate. It is one of the famous yam production bases. Therefore, the raw material yam for Yuhuaifu yam vermicelli is generally collected from local yam.