Looking to brush up on your geography? If so, check out Seterra. Originally created in 1998 for Windows computers, Seterra is freely available online or for purchase as a mobile application. Users can test their knowledge of countries, states, provinces, rivers, lakes and cities through interactive quizzes, all of which are browsable by continent. Once visitors select a quiz, they will be asked to locate an item (e.g. state, river, city) on a blank map. When users click on the incorrect area, the correct name for that region will be shown - allowing users to learn as they go. Each attempt to fill out a map is timed and graded for accuracy.