🇺🇸 Washington, United States

Washington, D.C., the capital of the United States, has a population of approximately 700,000. While it is not a coastal city, it is located on the Potomac River, which is navigable for smaller vessels. The city does not have a significant presence of ports, shipyards, or factories producing ship parts, but it serves as the center of government and international relations, making it of interest to seafarers involved in diplomatic and political activities.