What is Asia's longest river, also known as the 'Blue River', called?

Explanation

The Yangtze is the longest river in Asia. The 'Blue River', as it is also known as, flows from the Kunlun Shan Mountains in Western China and runs through the country before emptying into the East China Sea. It drains some 1.960.000 km² of land and its estuary is 190 kms wide.