This is the 3423rd most frequent Japanese word.
港湾
Port and harbor.
In this sentence, '港湾' refers to the general concept of a port area, including docks and other facilities for trade and transportation activities.
港湾は貿易の中心地です。
Port facilities are the center of trade.
Here, '港湾' is used to denote specific port locations or facilities within a region, emphasizing their multiplicity and distribution.
東京には多くの港湾が存在します。
There are many port areas in Tokyo.
In this instance, '港湾' is utilized in an administrative or planning context, indicating the infrastructure and systems related to harbor management.