evidence: Yi Sun-shin is pardoned for leading the victory by the white army in this battle. Nokdundo Island disappeared from history until the late 19th century. This period coincides with the time when the Qing Dynasty and Joseon paid the border area as an uninhabited land. However, Roh Gye-hyun, a former professor at Korea Communications University, explained, "It is clear that Nokdundo Island was the territory of Joseon even at that time." Nokdundo Island was the living base for Koreans from the beginning of the Joseon Dynasty until Stalin's forced migration in 1937. Now, traces of Koreans' lives such as Yeonja millstones and house sites are found throughout the estimated Nokdundo Island on land. Russia has designated the mouth of the Tuman River around the old Nokdundo Island as a military area and controls the access of the general public.-Photo courtesy of the Tuman River Land Use Research Team ● The problem of becoming an "island not an island" due to terrain changes is that the water stream in the north of Nokdundo Island gradually became thinner due to frequent flooding of the Tuman River, leading to Nokdundo Island and coastal waters.