Hallasan is a shield volcano on Jeju Island in South Korea. Its summit, at , is the highest point in the country. The area around the mountain is a designated national park, the Hallasan National Park (한라산국립공원, 漢拏山國立公園). Hallasan is commonly considered to be one of the three main mountains of South Korea, along with Jirisan and Seoraksan.
Hallasan is the highest mountain in South Korea and is worshipped by people as they believe that gods and spirits live on the mountain. Alternate English names for the mountain include Hanla Mountain or Mount Halla and older English sources refer to the peak as Mount Auckland. Hallasan is written in Hangul as if it were Hanrasan (한라산); however, it is still pronounced as Hallasan. In the past, Hallasan has been known by numerous other names in Korean including Buak (부악/釜岳), Wonsan (원산/圓山), Jinsan (진산/鎭山), Seonsan (선산/仙山), Dumuak (두무악/頭無岳), Burasan (부라산/浮羅山), Yeongjusan (영주산/瀛州山), and Hyeolmangbong (혈망봉/穴望峯). Every name of Hallasan has meanings and legends.
The name represents a mountain that is located at the back side of a town and protects the town's residents. Jeju people called Hallasan Jinan because Hallasan blocked winds that were blowing from the Pacific Ocean and also protected the residents.
Dumuak is another name for Hallasan. The name represents the bold head mountain. According to a legend, a hunter accidentally ripped God's belly button. God expressed his anger by ripping off the peak of Hallasan. The remaining part of the mountain became Baengnokdam (백록담) and the ripped part of the mountain became Sanbangsan (산방산).
Wonsan became the name of Hallasan because the center of the mountain is the highest point and the mountain looks like a circular cone. On a very clear day, Hallasan is visible from the mainland.
Yeongjusan was believed to be a habitat for a plant species that made people immortal. According to a legend, immortal wizards of Korea used to live in Hallasan. They were immortal because of this special plant. Qinshi Huang wanted the plant to live forever and ordered his men to get the plant (200 AD).