Escaping Slavery: Life Inside North Korea - Documentary Channel North Korea, is a country in East Asia, in the north component of the Korean Peninsula. The funding and biggest city is Pyongyang. North Korea shares a land border with China to the north and north-west, along the Amnok (Yalu) and Tumen streams. A tiny section of the Tumen River additionally forms North Korea's border with Russia to the northeast. The Korean Demilitarized Zone marks the boundary between North Korea and South Korea. The authenticity of this perimeter is declined by either side, as both states declare to be the reputable government of the entire peninsula. The Empire of Japan annexed Korea in 1910. In 1945, when Japan was defeated in World War II, Korea was separated into 2 areas, with the north inhabited by the Soviet Union and the south by the United States. Settlements on marriage failed, and in 1948 two separate federal governments were formed: the Democratic People's Republic of Korea in the north, and the Republic of Korea in the south. The contrasting claims of sovereignty resulted in the Korean War in 1950.