Oido Island (오이도)

Located off the western coast of the city of Siheung, Oido Island was originally an island and then connected to the mainland during the Japanese occupation as its tidal flats were used as a salt plant. During the day, the blue sea and the red lighthouse, the symbol of Oido, create a picturesque scene. In the evening, visitors can enjoy the spectacular sight of red sunsets over the sea. It also includes the largest prehistoric site on the west coast. The expansive tidal flats are home to a wide variety of creatures, attracting seasonal migratory birds.