South Korea (한국, 韓國 Hanguk), officially the Republic of Korea (대한민국, 大韓民國 Daehan Minguk) is a country in East Asia. South Korea occupies the southern half of the Korean Peninsula, with North Korea to the north, China across the sea to the west and Japan a short ferry ride to the southeast.South Korea (한국, 韓國 Hanguk), officially the Republic of Korea (대한민국, 大韓民國 Daehan Minguk) is a country in East Asia. South Korea occupies the southern half of the Korean Peninsula, with North Korea to the north, China across the sea to the west and Japan a short ferry ride to the southeast.