Derong County is located in the dry-hot valley of Hengduan Mountains, along the Jinsha River at the junction of Sichuan, Yunnan and Tibet provinces (regions), and is the bridgehead of the southern extension of Ganzi Prefecture. With a total area of 29 16 square kilometers, it governs 4 towns and 6 townships, 100 administrative villages and 3 communities, with a total population of 24,500, of which Tibetans account for more than 95%.
The mountains in the county are high and the valleys are narrow. Extremely high mountains, high mountains and semi-high mountains account for 99% of the total land area, and flat dams in river valleys only account for about 1%. The available land area is scarce, and the development of infrastructure such as transportation is seriously lagging behind.
Derong County is a Tibet-related county that integrates the old, the young, the border and the poor, just in front of the Medog Highway in Tibet. The overall situation of Derong County can be summarized as follows: "The location advantage is obvious, but the basic conditions are lagging behind; The resource endowment is outstanding, but the mining capacity is limited. "
topography
Derong county has a complex terrain. According to Sichuan Geography, at the end of Tertiary, some micro-plots in Batang and Derong areas of Sichuan were split. After the Quaternary, under the action of various geological external forces, the surface gradually rose and was cut into alpine canyon landforms.
The valley area in Derong County is mainly a slope, and there is proluvial accumulation at the mouth of the ditch. According to its cutting degree, it can be divided into three types: deep cutting, medium cutting and shallow cutting.
Derong County belongs to the southeast edge of the Qinghai-Tibet Plateau. During the Mesozoic Jurassic period about 1 100 million years ago, under the strong east-west pressure of the crust, a series of huge folds and fault zones in the north-south direction were produced, accompanied by a large number of magma intrusions, forming the original Hengduan Mountains.
Derong County is high in the north and low in the south, and the northern ridge line is generally about 5000 meters. Gajin Snow Mountain is 4920 meters above sea level, Dongwangya Mountain is 4769 meters above sea level, Geriding Mountain is 4949 meters above sea level, and Guiwengying Mountain is 4944 meters above sea level. The tributaries of Jinsha River in Derong County mostly originate from the northern mountainous areas, mostly downstream rivers.
However, Gaoji Mountain stands on the southeast edge of the county, with an altitude of 4,900-5,599 meters. The mountain behind Guoyong Village in Guxue is 5,599 meters above sea level, which is the highest peak in the county. However, the exit point of Jinsha River, which is less than 30 kilometers, is only 1.990 meters above sea level, with a relative height difference of 3,609 meters.
Reference to the above content: Baidu Encyclopedia-Derong County