What kind of place is Changdu?

Changdu area is located in the eastern part of western Tibet, in Hengduan Mountains and Sanjiang (Jinsha River, Lancang River and Nujiang River) basins. It is about 445 kilometers long from north to south and 527 kilometers wide from east to west. It faces Sichuan Province across the river to the east, Myanmar and Yunnan to the southeast, Linzhi to the southwest, Naqu to the northwest and Qinghai to the north. It is the east gate of Xizang Autonomous Region. Qamdo area covers an area of108600 square kilometers, accounting for about 9% of the total area of western Tibet, with an average elevation of more than 3500 meters. It is the highest plateau in the world and enjoys the reputation of "the roof of the world". Changdu area now governs 1 1 counties and 138 townships (towns) with a total population of about 620,000. Tibetan, Han, Hui, Naxi and other 2/kloc-0 brothers live in the whole region, and the minority population accounts for 98%. In the long historical process, people in Xizang, together with the Han nationality and other nationalities, has opened up a vast territory and created a splendid history and culture. Qamdo has a long history and was called Qamdo, Qamdo and Du Kang in ancient times. The people who live here are called Kangba, and they are known as the hometown of Reba, the hometown of black boy and the hometown of woodcut. Reba, Heizai and the unique traditional Tibetan opera are widely spread, which can be called the precious cultural heritage of the Chinese nation. Changdu has a diverse climate, with cold and dry northwest and north and mild and humid southeast; Long sunshine time, strong radiation and large temperature difference between day and night; Dry and wet alternate, rainy nights in summer, windy in winter and spring. The annual average temperature in Changdu area is 7.6 degrees Celsius, the annual rainfall is 400-600 mm, and the frost-free period is 80- 127 days. Because of the high mountains and deep valleys and complex terrain, it belongs to a three-dimensional climate; "Four seasons in one mountain, different days in ten miles" is a remarkable feature of the climate in Changdu area. It is the city with the least air pollution in China and an ideal summer resort. In this vast land, natural resources are extremely rich. Agriculture and animal husbandry forests, agricultural and sideline products, fish are readily available, and there are many varieties of melons, fruits, peaches and pears; Hydropower resources reach more than 3000 watts; There are 1500 kinds of trees; More than 600 species of birds and beasts; Thousands of wild medicinal plant resources; Nearly 100 kinds of metallic and nonmetallic minerals have considerable mining prospects. With the help of brothers and nationalities of all ethnic groups, the people of Qamdo described the great rivers and mountains of Qamdo with hard-working hands and smart wisdom, developed and utilized the rich local resources, and established a comprehensive industry integrating electricity, building materials, construction, printing, leather, coal, machinery, chemical industry, mining, tap water and other industries. Modern buildings and service facilities such as commerce, food, finance, meteorology, posts and telecommunications, medicine and health, culture, radio, television, restaurants, dance halls and so on have developed rapidly, covering the whole urban area. The world-famous Sichuan-Tibet Highway runs through Changdu, and the highway traffic with Changdu as the hub extends in all directions. National highways "2 14, 3 17, 3 18" give wings to Changdu. Changdu has Bangda Airport with the highest altitude and the longest runway in the world, Yulong copper mine with the second largest reserves in Asia and the first in China, Karuo site with more than 4,000 years, dinosaur fossils in Damara Mountain and so on.