Junggar basin:
Junggar basin (Chinese pinyin: zh ǔ n gá 283r pé n dí, English Junggar basin), located in the north of Xinjiang, China, is the second largest inland basin in China. Junggar basin is located between Altai Mountain and Tianshan Mountain, with the western hills of Junggar in the west and the foothills of Beita Mountain in the east. The basin is irregular triangle, and the terrain is inclined to the west, and the north is slightly higher than the south. Lake Ulungu (Bulento Sea) in the north is 479.438+0m above sea level, Lake Manas in the middle is 270m above sea level, and Lake Ebinur in the southwest is 189m above sea level, which is the lowest point in the basin. There are several gaps in the west side of the basin, such as Irtysh River Valley, Emin River Valley and Alashankou. The westerly airflow enters through the gap, bringing precipitation to the basin and surrounding mountains. 、
Sichuan basin:
Sichuan Basin is one of the four great basin in China. Also known as envelope basin and purple basin. It is surrounded by connected mountains, located in the south-central part of the Asian continent, in the heart of China and in the middle of the eastern edge of China. The total area is about 260,000 square kilometers, which can be clearly divided into two parts: marginal mountain and basin bottom, with an area of about 654.38+10,000 square kilometers and160,000 square kilometers respectively. Generally, there are 2 ~ 5 vertical natural zones from bottom to top in marginal mountainous areas.
The elevation of mountainous areas in Sichuan Basin is mostly between 1000 meters and 3000 meters. The basin bottom is low, with an altitude of 200-750 meters. Red rock series are widely exposed on the surface, which is called red basin. The western part of the basin is low-lying and fertile, and Dujiangyan water conservancy project has been built in Chengdu, northwest China. The eastern part of the basin is low mountains and hills. Fangshan Hill in the middle of the basin, accounting for 62% of the total area, is mainly composed of purple sandstone and shale. The basin also contains coal, oil, natural gas and minerals, such as salt, apatite and sulfur.
The bottom of Sichuan Basin is divided into three parts: parallel ridges and valleys in eastern Sichuan, hills in central Sichuan and Chengdu Plain in western Sichuan. The main cities in the basin are Chengdu, Mianyang, Luzhou, Nanchong, Zigong, Deyang, Guangyuan, Suining, Neijiang, Leshan, Yibin, Guang 'an, Dazhou, Ya 'an, Bazhong, Meishan and Ziyang in Sichuan Province, Zunyi and Bijie in Guizhou Province and Zhaotong in Yunnan Province. Generally speaking, the climate of the basin belongs to subtropical monsoon humid climate, but most areas of the basin are similar to temperate maritime climate.
Qaidam basin:
Qaidam basin is one of the three inland basins in China, and it is a closed giant intermountain fault basin. Located in the northwest of Qinghai Province and the northeast of Qinghai-Tibet Plateau. Surrounded by Kunlun Mountain, Qilian Mountain and Altun Mountain, it covers an area of about 250,000 square kilometers. "Qaidam" is a Mongolian language, which means "salt ze".