Nakdong River
As a barrier to movement, the Nakdong River gained sudden prominence during the Korean War. The southern length of the river formed the western portion of the Pusan Perimeter, which the UN forces fought to maintain during the autumn of 1950. The bridge over the Nakdong River at Waegwan was blown up on August 3, 1950 in an effort to prevent North Korean forces from advancing on Daegu. A large number of South Korean refugees were killed in the explosion. Although some North Korean forces did cross the Nakdong River in places, for the most part the river still marks their furthest advance.