The Great Hinggan Mountains are located in the northeast of China, with longitude 121°12′ to 127°00′ in the East and latitude 50°10′ to 53°33′ Located in the Great Hinggan Mountains of Heilongjiang Province and the northeast of Hulunbeir City, Inner Mongolia Autonomous Region, it is the watershed between Inner Mongolia Plateau and Songliao Plain.
The Great Hinggan Mountains
The terrain of the Great Hinggan Mountains is high in the West and low in the east. It is the first step, the second step and its junction. The first step is to the east of the ridge of the Great Hinggan Mountains in the North-South direction, and the second step is to the west. The whole area is permafrost zone, located in the south of permafrost zone. The west of Pangu River and the west of the straight line from south to east of Heyuan River are large permafrost zones with continuous permafrost for many years, and the other are Island permafrost zones. The Great Hinggan Mountains are the birthplace of the Erzhanna River and its main tributary Nenjiang River in the south of Heilongjiang Province. The Great Hinggan Mountains begin in the north along the Heilongjiang River and end in the upper valley of the Xilamulun River in the south. It is about 1400 km long, 15 km wide to 300 km and 600 m to 1000 m above sea level. The mountains are asymmetrical, high in the northwest, low in the southeast, steep in the East and gentle in the west. The surface is slightly cut. The mountains are round and round. There are obvious flat-topped mountains formed by ancient planation plane and wide valleys. Permafrost is widely distributed here, and there are obvious periglacial phenomena such as thawing mud flow and freezing cracking. The surface components are mainly granite, quartz trachyte and andesite.
The Great Hinggan Mountains are densely forested, with 7.3 million hectares of forest land and 74.1% forest coverage. It is one of the most important forestry bases in China. The main trees are Larix gmelinii, Pinus sylvestris var. mongolica, Picea koraiensis, Betula platyphylla, Quercus mongolica and Poplar. In dense forests, there are more than 1000 species of rare and exotic animals, such as cold temperate red deer, reindeer, moose (Kuda Bai), Sika deer, brown bear, sable, flying dragon, pheasant, bass chicken, swan, swear, roe, wild boar, snow rabbit and so on.