What is the geographical environment of Nanjing?

Nanjing is located in the middle of the lower reaches of the Yangtze River, in the southwest of Jiangsu Province. It is a national regional central city (East China), an important national gateway city driven by the radiation of the Yangtze River Delta, a node city where the "Belt and Road" strategy is connected with the Yangtze River Economic Belt strategy, and a core city of Nanjing metropolitan area. The total area is 6587.02km? 20 16 years built-up area 1 125.78km? .

Nanjing's landform belongs to Ningzhenyang hilly area, with low mountains and gentle hills as the main features. Low mountains account for 3.5% of the total land area, hills account for 4.3%, hills account for 53%, and plains, depressions, rivers and lakes account for 39.2%. Ningzhen Mountain Range and Laoshan Mountain in the north of the Yangtze River run through the middle of the city. There are Hengshan Mountain and Donglu Mountain in the south, which are located in the southern boundary of the hilly area of Qinhuai River Basin. Nanjing's plane position is long from north to south and narrow from east to west, forming a positive north-south direction; The straight-line distance between north and south is150km, the east-west width in the middle is 50-70km, and the east-west width at the north and south ends is about 30km. The southern part is a landform complex composed of low mountains, hills, valley plains, lakeside plains and rivers along the river.

Nanjing has a humid climate in the north subtropical zone, with four distinct seasons and abundant rainfall. Annual average rainfall 1 17 days, average rainfall 1 106.5mm, relative humidity 76%, frost-free period 237 days. The rainy season is from late June to early July every year. Average annual temperature 15.4℃, maximum annual extreme temperature 39.7℃, minimum-13. 1℃, average annual precipitation1106mm. ..

Nanjing enters spring in April 1, summer in June 8 and autumn in September 18. Winter is about 165438+ 10/2. Winter and summer are long, and spring and autumn are slightly shorter. Nanjing is short in spring and autumn, long in winter and long in summer, and the temperature difference between winter and summer is significant. Due to the change of atmospheric circulation and the continuous afforestation in Nanjing, the summer heat in Nanjing is much lower than that in other cities in Jiangnan and South China, so the name "stove" was removed.

The water area of Nanjing is more than 1 1%, including Qinhuai River, Jinchuan River, Xuanwu Lake, Mochou Lake, Baijia Lake, Shijiu Lake, Gucheng Lake and Jinniu Lake. The Yangtze River passes through the city with a coastline of nearly 200 kilometers. There are 0/20 rivers/kloc-in the territory, belonging to two rivers (Yangtze River, Qingyi River-Shuiyangjiang River), two lakes (Gucheng Lake, Shijiu Lake) and two rivers (Chuhe River and Qinhuai River). The water system is divided into four major water systems: Nanjing section of the Yangtze River, Chuhe River, Qinhuai River and Qingyijiang-Shuiyangjiang River.