Silmido (Silmi Island) is an uninhabited island next to Muuido (Muui Island) in the Yellow Sea. Silmido is located in the west coast of South Korea. It has 0.25081km2 land area and 6 km circumference. It is 20 km from Incheon Metropolitan City of southwest and is about 5 km away from Incheon International Airport. Silmido is connected two times a day to Muuido as mud flat.