Guizhou has three steps. What is the dividing line between the first step and the second step?

The topography of Guizhou is three steps, and the dividing line between the first step and the second step is the line of generosity, governance and general security. Guizhou's topography is high in the west and low in the east, and it slopes from the middle to the north, east and south, showing a three-step distribution.

China has a high altitude in the west and a low altitude in the east, which is characterized by a high terrain in the west and a low terrain in the east. The terrain of China is descending in three steps, which can be divided into three steps: the first step is China, the second step is China, and the third step is China.

The characteristics of cascade distribution make most rivers in China flow from west to east.

The first step of the ladder is mainly distributed near the Qinghai-Tibet Plateau, with an altitude of more than 4,000 meters.

The second staircase is mainly distributed in great basin, China, with an altitude of 1-2km.

The third step is mainly distributed in the main plains of China, below 500 meters above sea level.

Extended data

First, the first step in China

Basin: Qaidam Basin; Plateau: Qinghai-Tibet Plateau, located in the west of Kunlun Mountain, Qilian Mountain, Shan Zhinan Mountain and Hengduan Mountain, and north of Himalayan Mountain, with an average elevation of over 4,000 meters.

Second, the second step of China.

Inner Mongolia Plateau, Loess Plateau, Yunnan-Guizhou Plateau. The basins are: Junggar basin, Sichuan basin and Tarim basin, with an average elevation of 1000 ~ 2000m.

Third, the third step of China

Plain: Northeast Plain, North China Plain, Middle and Lower Reaches of the Yangtze River Plain; Hills: Liaodong hills, Shandong hills and southeast hills, among which the largest hill in China is the southeast hill. Most of them are below 500 meters above sea level.

The third step continues to extend to the ocean, forming an offshore continental shelf (the part where the mainland naturally extends to the ocean).