what is the source of two china's great rivers
Yangtze The river originates from several tributaries in the eastern part of the Tibetan Plateau, two of which are commonly referred to as the "source". Traditionally, the Chinese government has recognized the source as the Tuotuo tributary at the base of a glacier lying on the west of Geladandong Mountain in the Tanggula Mountains. This source is found at 33°25′44″N 91°10′57″E﻿ / ﻿33.42889°N 91.18250°E﻿ / 33.42889; 91.18250 and while not the furthest source of the Yangtze, it is the highest source at 5,342 m (17,526 ft) above sea level. The true source of the Yangtze, hydrologically the longest river distance from the sea, is at Jari Hill at the head of the Dam Qu tributary, approximately 325 km (202 mi) southeast of Geladandong.[49] This source was only discovered in the late 20th century and lies in wetlands at 32°36′14″N 94°30′44″E﻿ / ﻿32.60389°N 94.51222°E﻿ / 32.60389; 94.51222 and 5,170 m (16,960 ft) above sea level just southeast of Chadan Township in Zadoi County, Yushu Prefecture, Qinghai.[50] As the historical spiritual source of the Yangtze, the Geladandong source is still commonly referred to as the source of the Yangtze since the discovery of the Jari Hill source.[49]
River valley civilization The first great civilizations all grew up in river valleys, The oldest known civilization, 3300 to 2500 BCE, was along the Tigris and Euphrates rivers in the Middle East; the name given to that civilization, Mesopotamia, means "land between the rivers". The Nile valley in Egypt had been home to agricultural settlements as early as 5500 BCE, but the growth of Egypt as a civilization began around 3100 BCE. A third civilization grew up along the Indus River around 2600 BCE, in parts of what are now India and Pakistan. The fourth great river civilization emerged around 1700 BCE along the Yellow River in China, also known as the Huang-He River Civilization.[1][2]