入海口 Traditional form: 入海口 Pinyin (reading): rùhǎikǒu Definitions: estuary Characters: 入 - to enter, to come in; to join 海 - sea, ocean; maritime 口 - mouth; entrance, gate, opening Traditional characters: 入 - to enter, to come in; to join 海 - sea, ocean; maritime 口 - mouth; entrance, gate, opening