Introduction to the Lancang River: The Lancang River is the name of the upper reaches of the Mekong River in China. It is one of the largest rivers in southwest China. It is the ninth longest river in the world, the fourth longest river in Asia, and the longest river in Southeast Asia. The Lancang River is 2,179 kilometers long in China and flows through the three provinces of Qinghai, Tibet and Yunnan; the Mekong River flows through Laos, Myanmar, Thailand, Cambodia and Vietnam, and flows into the South China Sea in Ho Chi Minh City, Vietnam. The total drainage area is 810,000 square kilometers. It is the largest river in Asia. The most river flowing through the country is called the "Eastern Danube".