A river of eastern Asia, which rises in the mountains of Jilin province in north-eastern China and flows about 800 km (500 miles) generally south-westwards to the Yellow Sea, forming most of the border between China and North Korea.
A river in eastern Asia that rises in the mountains of Jilin province in northeastern China and flows southwest for about 500 miles (800 km) to the Yellow Sea. It forms most of the border between China and North Korea. In November 1950, the advance of UN troops toward the Yalu River precipitated the Chinese invasion of North Korea.