The Yellow River is the cradle of Chinese Culture as well as one of the drainage areas for the Four Great Ancient Civilizations, together with drainage areas of the Euphrates and Tigris River,the Nile River,and the Ganges River. Millennia ago the Chinese civilization emerged from the central region of this basin.
Tracing to a source high up the majestic the Bayankala Mountains in China's far west, the river is commonly divided into three stages. In the upper reaches, the river runs through mountainous and arid regions for 3,472 kilometers, ending at Hekouzhen of Inner Mongolia just before it makes a sharp turn to the south.
In the middle reaches, ending at Mengjin in Henan province, the river flows south, draining a basin consisting largely of thick deposits of unmodified Aeolian loess which is eroded readily by rainfall and wind. After traversing a 1100-kilometer course from Hekouzhen to Mengjin, the river emerges from narrow mountainous constrictions onto a flat alluvial plain shortly following a sharp turn to the east.