evidence: North Korea,[c] officially the Democratic People's Republic of Korea (DPRK),[d] is a country in East Asia. It constitutes the northern half of the Korean Peninsula and borders China and Russia to the north at the Yalu (Amnok) and Tumen rivers, and South Korea to the south at the Korean Demilitarized Zone.[e] The country's western border is formed by the Yellow Sea, while its eastern border is defined by the Sea of Japan. North Korea, like its southern counterpart, claims to be the sole legitimate government of the entire peninsula and adjacent islands. Pyongyang is the capital and largest city. [...] The coastal plains are wide in the west and discontinuous in the east. A great majority of the population lives in the plains and lowlands. According to a United Nations Environmental Programme report in 2003, forest covers over 70 percent of the country, mostly on steep slopes.[87] North Korea had a 2019 Forest Landscape Integrity Index mean score of 8.02/10, ranking it 28th globally out of 172 countries.[88] The longest river is the Amnok (Yalu) River which flows for 790 kilometers (491 mi).[89] The country contains three terrestrial ecoregions: Central Korean deciduous forests, Changbai Mountains mixed forests, and Manchurian mixed forests.[90]