Hongdo Island is a picturesque island located about a 2-hour and 30-minute ferry ride from Mokpo Harbor. The island earned its name due to its striking red appearance during sunset. It boasts stunning rock formations, coastal cliffs, and clear blue seas, creating a beautiful natural landscape. Designated as a protected area with rare plants and animals, it is recognized as a natural monument. One of the best ways to experience Hongdo Island is by taking a sightseeing boat tour to explore its surrounding 33 rocky islets and cliffs.