There are quite a few online geography games out there, and you can see them at The Best Online Geography Games. Many of them are pretty hard, and can be frustrating to students.
Spacehopper is a new online game that isn’t easy but, after showing you a Google Street View image of a location, provides clues that make it less difficult. You’re shown a map with various dots on it, as well as the map outline of the country. After three guesses, you’re given the answer along with information on the location.
Thanks to Google Maps Mania for the tip.