To 18 ports; the busiest crossings are to Deokjeokdo (1 hour 10 minutes, four times a day), Jawoldo (50 minutes, three times a day), Seungbongdo (1 hour 15 minutes, three times a day), Soijakdo (an hour and a half, three times a day), Daeijakdo (1 hour 35 minutes, three times a day), Soyeonpyeongdo (1 hour 35 minutes, twice a day), Yeonpyeongdo (2 hours, twice a day) and Socheongdo (3 hours, twice a day).