Hallasan is a shield volcano on Jeju Island in South Korea. Its summit, at 1,947 m, is the highest point in the country. The area around the mountain is a designated national park, named Hallasan National Park. Hallasan is commonly considered to be one of the three main mountains of South Korea, along with Jirisan and Seoraksan. The Hallasan Natural Reserve was designated as a South Korean Natural Monument number 182 on October 12, 1966.