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