Harbor cities are cities located on a body of water, such as an ocean, lake, or river, that have a port or harbor. These cities often serve as important trading and transportation hubs, and many of them have become popular tourist destinations. The two crossword solutions for the term 'harbor cities' are seaports (8 letters) and ports (5 letters). Seaports are ports located on the sea, while ports can be located on any body of water.