Udo Island is a small volcanic island located off the eastern coast of Jeju Island, South Korea. It covers an area of approximately 6.3 square kilometers and is known for its beautiful beaches, scenic landscapes, and unique rock formations. The island is a popular destination for tourists seeking outdoor activities such as cycling, hiking, and snorkeling. The island is home to a small population and features several traditional villages. Udo is famous for its local delicacies, including peanut ice cream and sea urchin. Visitors can explore the island's natural beauty by renting bicycles or scooters, making it an ideal spot for a day trip from Jeju.