The Republic of Korea (ROK or South Korea) Navy announced it has officially opened its new naval base on the southern resort island of Jeju. Jeju island is strategically located in a sea passage connecting the East China Sea and the Sea of Japan (East Sea) in the northwest Pacific Ocean. According to the ROK Navy, it took the country 23 years and more than 1 trillion won (US$806 million) to complete construction of the base.