"MIG Alley" is the name given by U.S. Air Force pilots to the northwestern portion of North Korea, where the Yalu River empties into the Yellow Sea. During the Korean War, it was the site of numerous dogfights between U.S. fighter jets and those of the Communist forces, particularly the Soviet Union. The F-86 Sabre and the Soviet-built MIG-15 'Fagot' were the aircraft used throughout most of the conflict, with the area's nickname derived from the latter. Because it was the site of the first large-scale jet-vs-jet air battles, MiG Alley is considered the birthplace of jet fighter combat.