The Yellow River, or Huanghe, is the second longest river in China. Tracing to a source high up the majestic Yagradagze mountain in the nation's far west, it loops north, bends south, and flows east for 5,464 km until it empties into the sea, draining a basin of 745,000 sq km, which nourishes 120 million people. This river carries lots of mud and sand thus it becomes yellow in colour. Millennia ago the Chinese civilization emerged from the central region of this basin. The Yangtze River is the longest river in Asia and third longest in the world. The headwaters of the Yangtze are situated at an elevation of about 16,000 feet in the Kunlun Mountains in the southwestern section of Qinghai. It flows generally south through Sichuan into Yuanan then northeast and east across central China through Sichuan, Hubei, Auhui, and Juangsu provinces to its mouth, 3,720 miles, in the East China Sea north of Shanghai. The river has over 700 tributaries but the principal tributaries are the Hun, Yalong, Jialing, Min, Tuo Jiang, and Wu Jiang. The climate ranges from 96 degrees in the summer to cold, brisk temperatures in the winter. Precipitation is high due to the height of the mountains.