河か口こう港こう

noun

port at the mouth of a river; estuary port

Refers to a port located where a river meets the sea, often handling both river and ocean traffic.

• その河か口こう港こうは、川かわと海うみの両りょう方ほうの船ふねが利り用ようできる。

  That estuary port can be used by both river and ocean vessels.