Cao Cao led Yanzhou animal husbandry, and where does "Yanzhou" refer to now?

Yan wrote "Lingzhou" in ancient times, and "Yanzhou" was written as "Lingzhou" in Historical Records Xia Benji. It was one of Kyushu in ancient times and is now called Yanzhou District of Jining City (Kyushu is Jizhou, Yanzhou, Qingzhou, Xuzhou, Yangzhou, Jingzhou, Yuzhou, Youzhou and Yongzhou). More than 4,000 years ago, Yu Xia designated the world as Kyushu, and Yanzhou was one of them. More than two thousand years ago, Confucius, Mencius and Ceng Zi all gave lectures here. The poet Li Bai once lived here. The word "Yanzhou" appeared after the Spring and Autumn Period. During the Spring and Autumn Period and the Warring States Period, a hundred schools of thought contended and wrote books, and named Kyushu after Yu. Yanzhou was one of them.

Yanzhou's word "Yanzhou" comes from Yanshui. Yanshui, also known as Jishui, originated from Wu Wang in Jiyuan County, Henan Province. The Yellow River and the north of the Yellow River are two parts of water. Later, due to the change of water system, there was no water south of the Yellow River. "Jiao" written by Yan Shuigu. "Sanshui" in Biography can sometimes be written as "horizontal water" and placed above the word "allow". Later, seal script evolved into official script, and "horizontal water" became "six" and became the word "Yan" today.