ぼっかい 渤海 LinksSentence search for 渤海Sentence search for ぼっかいKanji details for 渤 and 海 Place1. Bohai (kingdom in Manchura and N. Korea, established after the fall of Goguryeo); Pohai; Bohai; Balhae; BokkaiWikipedia definition2. Bohai Discussions Log in to talk about this word.