Dzungarian Basin
The core of Dzungaria is the triangular Dzungarian Basin (also Junggar Basin) with its central Gurbantunggut Desert. It is bounded by the Tien Shan to the south, the Altai Mountains to the northeast and the Tarbagatai Mountains to the northwest. The three corners are relatively open. The northern corner is the valley of the upper Irtysh River. The western corner is the Dzungarian Gate with its railroad (opened in 1990). The eastern corner leads to Gansu and the rest of China. In the south an easy pass leads from Ürümqi to the Turfan Depression. In the southwest the Borohoro Mountains branch of the Tian Shan separates the basin from the upper Ili River.
The extensive Dzungarian Basin is in the Xinjiang Uyghur Autonomous Region in northwestern China. It is surrounded by mountains. The basin is located between the Mongolian Altai Mountains and Tian Shan to the south. The basin is similar to the larger Tarim Basin on the southern side of the Tian Shan Range. Only a gap in the mountains to the north allows moist air masses to provide the basin lands with enough moisture to remain semi-desert rather than becoming a true desert like most of the Tarim Basin, and allows a thin layer of vegetation to grow. This is enough to sustain populations of wild camels, jerboas, and other wild species.
The Dzungarian Basin is a structural basin with thick sequences of Paleozoic-Pleistocene rocks with large estimated oil reserves. The Gurbantunggut Desert, China’s second largest, is in the center of the basin. Aibi Lake is the basin's catchment center.
The cold climate of nearby Siberia influences the climate of the Dzungarian Basin, making the temperature colder—as low as −4 °F (−20 °C)—and providing more precipitation, ranging from 3 to 10 inches (76 to 250 mm), compared to the warmer, drier basins to the south. Runoff from the surrounding mountains into the basin supplies several lakes. The ecologically rich habitats traditionally included meadows, marshlands, and rivers. However most of the land is now used for agriculture.
It is a largely steppe and semi-desert basin surrounded by high mountains: the Tian Shan (ancient Mount Imeon) in the south and the Altai in the north. Geologically it is an extension of the Paleozoic Kazakhstan Block and was once part of an independent continent before the Altai mountains formed in the late Paleozoic. It does not contain the abundant minerals of Kazakhstan and may have been a pre-existing continental block before the Kazakhstan Block was formed.
Ürümqi, Yining and Karamai are the main cities; other smaller oasis towns dot the piedmont areas.
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