evidence: It was Joseon territory for 400 years since the reign of King Sejong , but after the Second Opium War ended with the defeat of the Qing Dynasty, it was incorporated into the Russian Empire in accordance with the Treaty of Beijing signed between the Qing Dynasty and the Russian Empire in 1860. North Korea recognized Noktundo as Soviet territory in accordance with the 1990 Soviet-North Korean Border Treaty. This trend has continued since the collapse of the Soviet Union, and Russia , which succeeded the Soviet Union, now governs Noktundo, and Russian border guards guard the island. [...] In conclusion, Noktundo Island is recognized as Russian territory from an international law perspective, and there is insufficient evidence and justification to support the South Korean government's claim of sovereignty. From a practical perspective, Noktundo Island is nothing more than a wasteland of low value, and it is not worth trying to recover it by causing friction with Russia, with which South Korea maintains a good economic and diplomatic relationship. However, based on the recently raised Soduman River boundary, the area of Noktundo Island is approximately 400㎢, which is 12.5 times the existing boundary, which is almost the same as the area secured by Saemangeum , the largest reclamation project in South Korea (409㎢), and it is about 2/3 the size of Seoul, and it should be kept in mind that the area bordering the sea has also increased, which can help secure territorial waters .