Muuido, also known as Muui Island, is an island in South Korea. It is a small island located south of Yongyu Island, which was joined with Yeongjong Island when Incheon International Airport was built. Muui Island measures 5.2 kilometres (3.2 mi) long and 4.5 kilometres (2.8 mi) wide. The island is visible from the airport. The island's name, "Muui", means "dancer's dress" in Korean. It is a beautiful spot popular with locals and expat tourists, who like to visit the two main beaches of the island, Silmi Beach and Hanagae Beach.