What exactly are you asking? What support do you require?
Workbook that shows the tree (continent-country-city) using a sankey diagram
Here's a template I created for building Sankeys, if you'd like to try it. Chart Templates Part 1: Sankeys - Ken Flerlage: Analytics Architecture, Strategy, & Visualization
You may also want to try an icicle chart for this data: Dueling Data: Data16 Deleted Slides - Icicle Charts