​Hallasan (한라산) - located on Jeju Island, the only island province of South Korea, Mount Halla/Han-Ra is South Korea's highest mountain and point at 6,388 ft. It is reportedly a shield volcano (composed almost entirely of lava flows), with its last eruption occurring in 1007 CE. 

Jeju Island is one of ROK's nine provinces and is a popular tourist attraction. 

Source: ephotopix.com