"Yalu." YourDictionary, n.d. Web. 09 December 2018. <https://www.yourdictionary.com/yalu>.
Yalu. (n.d.). Retrieved December 09th, 2018, from https://www.yourdictionary.com/yalu
A river, about 800 km (500 mi) long, forming most of the North Korea-China border. In 1950, Chinese troops crossed the river to meet oncoming United Nations-sponsored forces, thus entering the Korean War.