1712年(清康熙五十一年,朝鲜肃宗三十八年),穆克登第二次前往中朝边境,勘查图们江界河。在朝方的协助下,穆克登确认了图们江和鸭绿江的正源,在此二江的分水岭上立下一座简陋的石碑,用以标示中朝界河发源于该处。碑文曰:“大清乌喇总管穆克登奉旨查边至此,审视西为鸭绿,东为土门 In 1712 (fifty-one years of the Qing Emperor Kangxi, thirty-eight years of North Korea Suzong), Mukden went to the border between China and North Korea for the second time to survey the Tumen River boundary river. With North Korea’s assistance, Mukden confirmed the origins of the Tumen River and the Yalu River, and set up a crude stele on the watershed of the two rivers to mark the origins of the Sino-Korean border river. The inscription reads: "Qing Wu La Mu chief director of imperial edict to check the border at this point, looking west duck, East Tumen