To 15 ports; the busiest crossings are to Tanjung Priok (Jakarta) (34 hours, four times a month), Ujung (Surabaya) (3 days, four times a month), Letung (13 hours, twice a month), Belinyu (15 hours, twice a month), Tarempa (18 hours, twice a month), Selat Lampa (Natuna) (30 hours, twice a month), Midai (37 hours, twice a month) and Serasan (47 hours, twice a month).