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The Democratic People's Republic of Korea, commonly called North Korea, is a country in East Asia, in the northern half of the Korean Peninsula. Its capital is Pyongyang, the country's largest city by both land area and population. The Amnok River and the Tumen River form the international border between North Korea and China. A small section of the Tumen River also lies along the border between North Korea and Russia, technically following the river's thalweg. The Korean Demilitarized Zone forms the boundary between North Korea and South Korea. The legitimacy of this border is not accepted by either side, as both states claim to be the legitimate government of the entire peninsula.The Korean peninsula was governed by the Korean Empire from the late 19th century to the early 20th century, until it was annexed by the Empire of Japan in 1910. After the surrender of Japan at the end of World War II, Japanese rule ceased. The Korean peninsula was divided into two occupied zones in 1945, with the northern half of the peninsula occupied by the Soviet Union and the southern half by the United States. A United Nations–supervised election held in 1948 led to the creation of separate Korean governments for the two occupation zones: the Democratic People's Republic of Korea in the north, and the Republic of Korea in the south. The conflicting claims of sovereignty led to the Korean War in 1950. An armistice in 1953 committed both to a cease-fire, but the two countries remain officially at war because a formal peace treaty was never signed. Both states were accepted into the United Nations in 1991.