Yan 'an City, a prefecture-level city in Shaanxi Province, is the first mausoleum in the world-the location of Huangdi Mausoleum, the ancestor of the Chinese nation, and a national and revolutionary shrine. The first batch of national historical and cultural cities announced by the State Council is 256 kilometers wide from east to west and 236 kilometers long from north to south, with a total area of 37,037 square kilometers. Known as "three Qin lock keys, five throats."
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The geographical environment of Yan 'an:
topography
Yan 'an City is located in the middle reaches of the Yellow River and belongs to the hilly and gully region of the Loess Plateau. Yan 'an landform is dominated by loess plateau and hills. The terrain is high in the northwest and low in the southeast, with an average elevation of about 1200m. Baiyu Mountain in the north is 1600- 1800 meters above sea level, and the highest point is Baiyu Mountain in Guwu Township, Wuqi County, with an altitude of 1809.8 meters. The lowest point is in Houerchuan, Jiyi Township, Yichuan County, with an altitude of 388.8m and a relative height difference of1421m.
Climatic characteristics
Yan 'an City belongs to a warm temperate semi-humid arid climate zone, and the annual climate change is controlled by monsoon circulation. March-May is spring, June-August is summer, September-165438+10 is autumn, and June-February-February is winter. Spring is dry and rainy, the temperature rises rapidly, the climate is changeable, and there is strong wind and sand. Intraseasonal precipitation accounts for 65,438+07% of the annual total. The average temperature in March is 4.5℃, and the average temperature in May is 65438 06.9℃, and the highest temperature can reach 36.5℃. When strong cold air strikes, the minimum temperature can drop to about 0℃, resulting in frost.
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