When you have to cover topics from different locations around the world it is nice to tell your audience that you will take them on a tour around the world. This builds up a nice anticipation about the places you are going to talk about.
You can then refer to the locations as part of your introduction and then cover them in more detail. You could use a phrase to make the transition from one location to the next by saying.
“So that covers Europe and now let’s spin the globe to go to the US.”
“Let’s spin the globe again to go to the next location which will be Asia.”
Taking your audience on a tour around the world will create a nice theme to cover the topics from the different regions.