Seoul is the capital and largest city of South Korea. It is located on the Han River in the northwest of the country, with a population of over 10 million people. Seoul is one of the world's leading cities in terms of technology, finance, culture, and tourism. It is also home to many historical sites, including the Gyeongbokgung Palace, Changdeokgung Palace, and Jongmyo Shrine. Seoul is an important hub for international business and trade, and is a major transportation center for the region.