Hallasan is a shield volcano located on Jeju Island in South Korea. It stands at 1,947 meters (6,388 feet), making it the highest mountain in South Korea. The volcano is known for its unique biodiversity, featuring various plant and animal species, some of which are endemic to the region. The mountain is a popular destination for hikers, offering scenic trails that lead to its summit. At the top, visitors can find a crater lake called Baengnokdam, which adds to the natural beauty of the area. Hallasan is also a designated national park, emphasizing its ecological significance.