こっかい 国界 LinksSentence search for 国界Sentence search for こっかいSentence search for 国堺Kanji details for 国 and 界Edit in JMdict Noun1. border (between countries); national borderRare term, See also 国境 こっきょうOther forms国堺 【こっかい】 Discussions Log in to talk about this word.