Claim: North Korea is divided from South Korea by the Korean Demilitarized Zone.
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.