Daxing 'anling region is located in the northernmost border of the motherland, bordering Xiaoxing 'anling in the east, Inner Mongolia Autonomous Region in the west, the vast Songnen Plain in the south, and Russia in the north with the center line of Heilongjiang main channel. East longitude 12 1 12' to127 00'; North latitude 5010' to 53 33'. It covers an area of 84,600 square kilometers.
Geographical significance of Daxinganling: 1. The dividing line between Northeast Plain and Inner Mongolia Plateau.
2. The dividing line between the second and third levels of the terrain.
3. The dividing line between monsoon region and non-monsoon region
4. The dividing line between temperate monsoon climate and temperate continental climate.
5. The dividing line between agriculture and animal husbandry (400 mm isoprecipitation line)
6. Boundary between internal flow area and external flow area
7. The dividing line between semi-humid area and semi-arid area
8. The dividing line between forest belt and grassland belt
Xiaoxing 'anling, which is about 500 kilometers long, is connected to Ilhuli Mountain in the northwest and Songhua River in the southeast. Xiaoxing 'anling West confronts Daxing 'anling, also known as "Dongxing Anling" and "Bulun Mountain". It runs through the north-central part of Heilongjiang Province.
Xiaoxing 'anling is a low mountain and hill, and its geographical feature is "eight mountains, half water, half grass and one field". There are many terraces and wide valleys in the north; Low mountains and hills in the middle, gentle mountains; To the south is a low mountain with high mountains and steep slopes. The highest peak is Pingdingshan, with an altitude of 1, 429 meters. Tieli city in the west is located in Songnen Plain, where the terrain fluctuates greatly.