South Korea, officially the Republic of Korea (ROK) (Korean: 대한민국,), is a country in East Asia, located on the southern half of the Korean Peninsula. It is neighbored by China to the west, Japan to the east, and North Korea to the north. Its capital is Seoul. South Korea lies in a temperate climate region with a predominantly mountainous terrain. Its territory covers a total area of 100,032 square kilometers and has a population of over 50 million.