South Korea is a country in the southern part of the Korean peninsula, in the north east region of Asia. The capital city is Seoul. The official name of South Korea is the Republic of Korea in English, 대한민국 (Daehan Minguk) in Korean writing (Hangeul), and 大韓民國 in Chinese characters (Hanja). About half of the country's people live in its capital city, Seoul, or near the city in the metropolitan area. Korea's Seoul metropolitan area is one of the most populous metropolitan areas in the world. In fact, some sources say it is the second most populous after Tokyo, Japan.