Silmido is an uninhabited island next to Muuido 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.