Vocabulary What does 海域 (かいいき, kaiiki) mean? 海域 (かいいき, kaiiki) means area of sea; waters. Quick factsReadingかいいきRomajikaiikiPart of speechnoun 海域かいいきkaiikiarea of sea; waters1noun area of sea; watersKanji in this word海sea域region, area; scope