Location
It was never made explicitly clear where Bigg City Port actually was. Some of the confusion arises from the fact that, with a few exceptions, the characters have British accents, yet the port itself appears to be set in the United States. The liner characters also have American-styled funnels. Emphasising this, the port holds an annual regatta for the July 4th celebrations, as shown in the episode "4th of July".
Read more about this topic: Bigg City Port