ないかい 内海 Common word LinksSentence search for 内海Sentence search for ないかいSentence search for うちうみKanji details for 内 and 海Edit in JMdict Noun1. inland sea; inlet; gulf; bayNoun2. lakeArchaic, Only applies to うちうみOther forms内海 【うちうみ】 Discussions Log in to talk about this word.