peninsula & country in E Asia, extending south from NE China: divided (1948) into a) () occupying the N half of the peninsula: 47,399 sq mi (122,762 sq km); pop. 23,030,000; cap. Pyongyang, and b) () occupying the S half of the peninsula: 38,326 sq mi (99,263 sq km); pop. 43,412,000; cap. Seoul