Try to write a short passage to describe the geographical characteristics of Huainan.

Bozhou climate is located in the southern edge of warm temperate zone, belonging to warm temperate semi-humid climate zone, with obvious transitional characteristics, mainly characterized by obvious monsoon, mild climate, abundant sunshine, moderate rainfall, long frost-free period, distinct seasons, changeable temperature in spring, concentrated rain in summer, crisp autumn and long dry winter. Due to the climate transition, cold and warm air masses meet frequently, the weather is changeable and the annual precipitation changes greatly. The average annual temperature 14.9℃, average sunshine time 2 184 hours, average frost-free period 2 13 days and average annual precipitation 83 1mm in the whole city.

hydrology

The rivers in Bozhou area belong to Huaihe River system, and the main rivers are Wohe River, Xifeihe River, Cihuaixin River, Beifeihe River and Hepeng River. On the left bank of the Guohe River, Daiqiao Natural Village, the administrative village of Lingzimen, Niuji Town, Qiaocheng District, entered the territory first, and then passed through Guoyang County to Mengcheng County in the southeast, leaving the country and entering Huaiyuan County, with a total length of 173 km and a drainage area of 4,039 square kilometers. Xifeihe River enters from Hefei Town, Qiaocheng District, flows through Guoyang County in the southeast, and leaves Fengtai and Yingshang County in Zhangou Town, Lixin County, with a length of123.4km and a drainage area of 187 1 km2. Cihuai New River enters from Daliji Town, Lixin County, flows eastward through the south of Lixin County, and leaves Huaiyuan County at Zoulou, Mengcheng County, with a length of 66 kilometers and a drainage area of 140 1 square kilometer.

Bozhou is rich in natural resources and is one of the important production bases of commodity grain, high-quality livestock products, commercial timber forests and vegetables in China. As of 20 13, the total land area of the city is 852,258 hectares, including 707,929 hectares of agricultural land,124,790 hectares of construction land and 19539 hectares of unused land. Underground coal and oil resources are very rich, with a total proven resource reserve of 5.7 billion tons, including coal reserves of 4.723 billion tons. The city's total water resources are 2.656 billion cubic meters. More than 400 varieties of Chinese herbal medicines are planted, covering an area of 52.28 thousand hectares.