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📍Address: Udo is located in the eastern sea of Jeju City, Jeju Province, South Korea. 🚗Transportation: 1. Bus: Take a bus to Seongsan Port at Jeju Intercity Bus Terminal or Jeju Seogwipo Bus Terminal, and then take a cruise to Udo at Seongsan Port. 2. Self-driving or taxi: You can drive or take a taxi to Seongsan Port, and then take a boat to Udo. 👍️Must-see attractions: 1. Coral Sand Beach: The only coral sand beach in Korea, with colorful and clear sea water. 2. Udobong Peak: You can enjoy the panoramic view of Udo and Seongsan Ilchulbong Peak. 3. Huhai Rock Wall and Dong'an Whale Cave: Huhai Rock Wall is 20m high and 30m wide, surrounding the Black Sand Beach; Dong'an Whale Cave is one of the most famous caves in Udo. 4. Ganeungdong Observatory: Located at the northernmost tip of Udo, there is a white lighthouse and the ruins of an ancient beacon tower, suitable for taking photos. 🎟️Tickets: Udo itself does not charge admission, but you need to buy a ferry ticket, which costs about KRW 11,000 for a round trip. 💗Other tips: 1. Transportation: Pay attention to the stops and return time when taking the island bus, and obey the traffic rules when renting a car or riding an electric bike. 2. Weather: The weather at the seaside is changeable, so take sun protection and windproof and warm measures. 3. Culture and customs: Respect local culture and customs, and do not touch or damage cultural relics when visiting cultural sites.