"Largest port" refers to a harbor or docking area that is the biggest in terms of size or capacity. It is a place where ships can load and unload goods, and it usually handles a large volume of shipping traffic. Full definition
Being one of the world's largest ports creates a transient space between water and land, home and away, environment and industry. (workreleasenorfolk.com)
The city is housed with second largest port in India making it a large market for national and international trading. (luxoindia.com)