海かい域いきかいいきCommon wordFreq.FrequencyTop 10,000Meanings1nounsea area; watersRefers to a defined area of the sea, often used in geographical, legal, or navigational contexts.この海かい域いきではイルカがよく見みられる。Dolphins are often seen in this sea area.政せい府ふは新あたらしい海かい域いきの調ちょう査さを始はじめた。