Things to reivew:
Longitude and Latitude
The oceans and seas
The United States
This is a "game" to track where Harry Potter is going. You'll need to have enough questions (clues) for everyone in your class. Some sample questions are:
"Harry has been spotted riding his broom from Africa to North America, what ocean will be be flying over?" This can be done for directions also.
My kids really liked this lesson.