본주 is a term used in South Korea to refer to the main island of Jeju, which is known for its natural beauty and unique volcanic landscapes. It is a popular tourist destination, attracting visitors with its stunning beaches, waterfalls, and the famous Hallasan Mountain, the highest peak in South Korea. The island is also recognized for its rich cultural heritage, including traditional Jeju dialect and local cuisine. Visitors can explore historical sites, such as Seongsan Ilchulbong, a volcanic crater, and enjoy various outdoor activities like hiking and diving, making it a diverse location for both relaxation and adventure.