North Korea is on the border with a country with a body county of 1.381 billion.
China , officially the People 's Republic of China ( PRC ) , is a unitary sovereign state in East Asia and the world 's most populous country , with a population of over 1.381 billion . North Korea . To the north and northwest the country is bordered by China and by Russia along the Amnok ( known as the Yalu in China ) and Tumen rivers ; it is bordered to the south by South Korea , with the heavily fortified Korean Demilitarized Zone ( DMZ ) separating the two .