South Korea is a highly developed country and is ranked as the fifth-highest country on the Human Development Index (HDI) in the Asia and Oceania region. South Korea has the third-highest life expectancy in the world. In recent years, the country has been facing an aging population and the lowest fertility rate in the world. Its economy ranks as the world’s twelfth-largest by nominal GDP. Its citizens enjoy one of the world’s fastest Internet connection speeds and the densest high-speed railway network.