海かい湾わんかいわんMeanings1noungulf; bayA geographical term for a large inlet of the sea, often used in place names or formal descriptions.ペルシャ海かい湾わんは重じゅう要ような航こう路ろです。The Persian Gulf is an important sea route.この海かい湾わんには多おおくの漁ぎょ港こうがある。There are many fishing ports in this bay.