The Democratic People's Republic of Korea (DPRK; Chosŏn'gŭl: 조선민주주의인민공화국; Chosŏn Minjujuŭi Inmin Konghwaguk), 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.