It's noteworthy that the book lists three different places which are the subject of ethnic/regional jokes rather than just one. They are Cumae a Greek colony near present-day Naples in Italy, Abdera a city in Thrace, and Sidon in Lebanon. Even more noteworthy, however, is the fact that they never seem to appear together in any of the jokes - e.g. "A Cumaean, an Abderite and a Sidonian walk into a pub..."