Seoul is the capital city of South Korea.

Seoul is the largest metropolis in South Korea. According to the 2020 census, Seoul has a population of 9.9 million people and forms the heart of the Seoul Capital Area with the surrounding Incheon metropolis and Gyeonggi province. It is considered to be a global city and rated as an Alpha–City by Globalization and World Cities Research Network (GaWC), Seoul was the world's 4th largest metropolitan economy in 2014 after Tokyo, New York City, and Los Angeles. Seoul was the capital of various Korean states, including Baekje, Joseon, the Korean Empire, Goryeo (as a secondary capital), and presently South Korea. It is strategically located along the Han River.