Dictionary/公海こうかいKoukai公海 (Koukai) is a Japanese noun meaning “high seas, international waters”.Meaningsnounhigh seas; international watersKanji in 公海公public海seaRelated words君you海sea公園(public) park海外foreign公平fairness海豚dolphin (or other small toothed whales, incl. porpoises, belugas, etc.)公official海老prawn公安public peace北海道Hokkaido (island, prefectural-level administrative unit)主人公protagonist公表official announcement