There are a handful of geography apps that I love (StrataLogica, TapQuiz, Experience America HD, 3D Atlas) and Geography Duel is another option for students. This app lets users quiz their knowledge of US states and countries. It has a single player and multiplayer mode that lets students compete with a partner. This is a great app game for students who want to boost their knowledge of geography whether they play with a classmate or independently.
Check out Geography Duel in the Apple App Store for iOS devices!
Visit my Syllabuy page to view lots of tech-friendly lessons