Vocabulary What does 日本海 (にほんかい, nihonkai) mean? 日本海 (にほんかい, nihonkai) means Sea of Japan. Quick factsReadingにほんかいRomajinihonkaiPart of speechnoun 日本海にほんかいnihonkaiSea of Japan1noun Sea of JapanKanji in this word日day; sun本book; origin, root海sea
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