Postal code is a coding method that a country or region divides the whole country in order to realize the automation of mail sorting and the digitalization of postal network and speed up the delivery of mail. China postal code adopts four-level six-digit coding structure.

The first two figures represent provinces (cities, autonomous regions); The third digit indicates the postal area; The fourth digit indicates the county (city); The last two digits indicate the office.

Dandong 1 18000, Dalian 1 16000, Fushun 1 13000, Chaoyang 122000, Benxi/kloc-0.

Yingkou 1 15000, Huludao 125000, Liaoyang11000, Tieling 1 12000, Jinzhou 600.

Topographic features of Liaoning province

The topography of Liaoning Province is generally "six mountains, one water and three fields", with high terrain in the north and low terrain in the south. The mountains extend from east to west to the central plain. Liaodong and western Liaoning are mountainous hills with an average elevation of 800 meters and 500 meters, and the central part is the Liaohe Plain with an average elevation of 200 meters.

The mountains in Liaoning province are listed on the east and west sides respectively. The eastern mountain range is a continuation of Hadaling and Longgang Mountain, a branch of Changbai Mountain. It consists of two parallel mountains in the north and south, with an altitude of about 500-800 meters, and the highest peak elevation is 1300 meters.

The main mountain ranges are Mori Hongshan in Qingyuan, Motianling and Longgang Mountain in Benxi, Laotingzi Mountain in Huanren, Huajing Mountain, Dingzi Mountain in Kuandian, Fenghuang Mountain in Fengcheng, Qianlian Mountain in Anshan and Laotieshan Mountain in Lushun. The western mountains are formed by the transition from Inner Mongolia Plateau to Liaohe Plain, with an altitude of 300- 1000m, mainly including Nuruhu Mountain, Songling Mountain, Montenegro and Yiwulu Mountain.

Reference to the above content: Baidu Encyclopedia-Liaoning Province