North Korea, officially the Democratic People's Republic of Korea, is a country in East Asia, constituting the northern part of the Korean Peninsula. It borders China and Russia to the north, at the Yalu and Tumen rivers; it borders South Korea to the south at the Korean Demilitarized Zone. Its western border is formed by Korea Bay and the Yellow Sea, while its eastern border is defined by the Sea of Japan. North Korea, like its southern counterpart, claims to be the legitimate government of the entire peninsula and adjacent islands. Pyongyang is the country's capital and largest city. In 1910, Korea was annexed by the Empire of Japan. In 1945, after the Japanese surrender at the end of World War II, Korea was divided into two zones along the 38th parallel, with the north occupied by the Soviet Union and the south occupied by the United States.