When I came to Jinghong, I saw the Lancang River. The Lancang River Mekong is the largest river in Southeast Asia and the seventh largest river in the world. It is an international river that flows through China, Laos, Myanmar, Thailand, Cambodia and Vietnam. It is known as the "Eastern Danube River" because of the six countries. It is the most convenient water gold channel in Southeast Asia. The Lancang River originated in the northeast of Tanggula Mountain in Qinghai Province, China, and injected into the South China Sea in Ho Chi Minh City, Vietnam. The dry current is 4880 km long, and the western part is divided by the Nushan (South Section Biluo Snow Mountain), Bangma Mountain and other ridge lines and the Nu River, and the eastern part is divided by the Jinsha River and the Red River by Yunling and Wuliang Mountains. The Lancang River is the most typical river in the world. We know the Mekong tragedy, the Lancang River is the upper reaches of the Mekong River, the upper reaches of the Mekong River is called the Lancang River in China. When I came to Jinghong, I heard that the last paragraph of the Lancang River before leaving China was the most beautiful paragraph of the whole river. Wide, clear, gorgeous, rushing, strong environment... and the "most beautiful" section, when the Lancang River flows through the capital of Xishuangbanna Jinghong, shows its gentle side. The river is wide and the flow speed is flat, often reflecting the reflection of the city like a mirror.