Which three provinces do Henan, Anhui and Jiangsu refer to?

1. Henan, Anhui and Jiangsu provinces, in which Henan is Henan, Anhui is Anhui and Jiangsu is Jiangsu. The Henan-Anhui-Jiangsu Plain is a vast land at the junction of Henan Province, Anhui Province and Jiangsu Province, and it is the southern half of the North China Plain, the second largest plain in China.

2. The central and eastern part of China, the middle and lower reaches of the Yellow River, was named "Henan" period because most of it was south of the Yellow River. In ancient times, there were many rivers, dense forests and wild elephants. Therefore, Henan is vividly described as a place where people lead elephants. This is the origin of the hieroglyph "Yu" and the origin of Henan's abbreviation "Yu". Henan Province, the land of Yuzhou in ancient times, is called "Yu" for short.

3. "Anhui", according to the History of the Qing Dynasty, before the early Qing Dynasty, Anhui and Jiangsu (including Shanghai now) were a province-jiangnan province. In the 6th year of Kangxi (1667), in order to reduce "red tape", the Qing government divided jiangnan province into Anhui and Jiangsu provinces. In the twenty-five years of Qianlong (1760), it was officially designated as the provincial capital in Anqing prefecture (now Anqing city). Anhui Province is called "Anhui" for short, because there are mountains and water in Anqing and Anhui in Spring and Autumn.

4. "Su" was established in Jiangsu Province in the 6th year of Qing Emperor Kangxi (1667). Jiangsu province is composed of the initials of Jiangning (now Nanjing) and Suzhou (now Suzhou), the garrison places of the governors of the two rivers. Take the word "Su" in the full name as the abbreviation.