North Korea

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 the People's Republic of China. A small section of the Tumen River also lies along the border between North Korea and the Russian Federation, technically following the river's thalweg. The Korean Demilitarized Zone is the boundary between North Korea and South Korea. Wikipedia