Definition of "Yalu"

[...]the Founder of that Family, who took the Name of Yuen, and who is known in Europe by the Name of Zing hi, or Zing his kan, but whom the Chineſe Hiſtory calls Tchin bi ſe, and Tai tſou, after he had conquer’d the King had thoughts of carrying the War into Corea: His General, called Leou co immediately made himſelf Mafter of the Towns ſituated upon the Eaſt of the River Ya lou;[...]]

, P. Du Halde, “Geographical Obſervations on the Kingdom of Corea”, in The General History Of China‎, 2nd edition, volume IV, page 391

The Tumen river separates Corea from Manchooria, except in the last few miles of its course, when it flows by Russian territory, the south-eastern corner of Siberia. The Yalu river also divides Corea from Manchooria.

1895, Trumbull White, The War in the East Japan, China, and Corea‎, Philadelphia: P.W. Ziegler & Co., page 374

More recently, work has been opened in a town on the Yalu River, about 500 miles by boat from Dairen.

1935, A. W. Yocum, “From Dairen, Manchuria-Organized 1925”, in Annual of the Southern Baptist Convention‎, Memphis, TN, page 206

In an effort to limit the war to the borders of Korea, the United Nations forces were prohibited by political directive from firing across the Yalu River—a prohibition which made a sanctuary of Manchurian territory.

1963, Dwight Eisenhower, Mandate for Change 1953-1956‎, Garden City, New York: Doubleday & Company, page 176

Soon after the start of the Russian-instigated North Korean invasion of South Korea in June 1950, Peiping sent 200,000 “volunteers” across the Yalu.

1973 May 27, “Mao still embraces Stalin cult”, in Free China Weekly‎, volume XIV, number 20, Taipei, page 2

By this time, Kim II Sung already had the assurances of the Chinese that they would not allow his government to fall without a fight. So he retreated to Sinuiju, on the Korean side of the Yalu, just across from the Manchurian industrial center of Antung, and shouted curses over the radio waves at the United Nations, President Syngman Rhee, and the United States.

1984, Edwin P. Hoyt, “To the Yalu”, in On to the Yalu‎, New York: Stein and Day, page 247

Positioned near the mouth of the Yalu River, Dandong is China’s largest border town, and much of North Korea’s trade with the world flows across its old bridges or through its deepwater port.

2017 May 12, Jane Perlez, Yufan Huang, Paul Mozur, “How North Korea Managed to Defy Years of Sanctions”, in The New York Times‎, archived from the original on 12 May 2017, Asia Pacific‎