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Anhui Province, referred to as "Anhui" for short, is the provincial administrative region of People's Republic of China (PRC). Hefei, the provincial capital, is located in the Yangtze River Delta in the east of China, with a land span of11454'-1937' and a latitude of 29 4 1.

The terrain is composed of plains, hills and mountains, and it is located in the transition zone between warm temperate zone and subtropical zone. By July 2020, there will be 16 prefecture-level cities in Anhui province, with a total area of 14.05438+0 million square kilometers. By the end of 2022, the permanent population of the province was 665,438 +0.27 million.

Anhui province belongs to the transitional area between warm temperate zone and subtropical zone in climate. The north of Huaihe River has a warm temperate semi-humid monsoon climate, and the south of Huaihe River has a sub-humid monsoon climate.

Its main characteristics are obvious monsoon, four distinct seasons, warm and changeable spring, concentrated rain in summer, crisp autumn and cold winter. Anhui is also located in the mid-latitude zone. With the alternation of monsoon, the seasonal variation of precipitation is obvious, which is one of the areas with obvious monsoon climate.

Spring and autumn in Anhui Province are the transitional periods from winter to summer and from summer to winter. The annual frost-free period is 200-250 days, and the active accumulated temperature of 10℃ is around 4600-5300℃. Annual average temperature 14- 17℃, June average temperature-1-4℃, July average temperature 28-29℃.

The average annual precipitation is 773- 1670 mm, which is characterized by more in the south and less in the north, more in the mountains and less in the plains and hills. Summer precipitation is abundant, accounting for 40%-60% of the annual precipitation. On September 20, 2022, according to meteorological drought monitoring, moderate to severe meteorological drought still existed in Anhui Province and other places.

There are more than 2000 rivers in Anhui province. Except the southern Xin 'anjiang River system belongs to Qiantang River basin, the rest belong to the Yangtze River and Huaihe River basin. The Yangtze River flows from Hukou, Jiangxi Province to Wujiang, the county.

From southwest to northeast, it obliquely crosses southern Anhui, with a total area of 4 16 km, belonging to the lower reaches of the Yangtze River, with a drainage area of 66,000 square kilometers. The Yangtze River flows through Anhui for 400 kilometers, Huaihe River flows through the province for 430 kilometers, and Xin 'anjiang River flows through the province for 242 kilometers.