🇺🇸 Castle Shannon, United States

Castle Shannon is a small borough located in Allegheny County, Pennsylvania, United States. It has a population of around 8,300 people. While it is not a coastal city, it is still of interest to seafarers, shipowners, and crewing companies as it is situated near the Port of Pittsburgh, which provides access to the Ohio River and connects to the Mississippi River system. The city also has a few shipyards and factories producing ship parts, making it a hub for maritime-related industries in the region.