My students always seem to be very weak in geography and so I incorporate it as much as I can when teaching history. One of the sites that I like to use is Lizard Point. I know that it's a strange name for a website, but it's useful and students enjoy using it as well. When I got onto the site to write this post, I also noticed several new features, such as creating an account to track progress, submitting scores, etc. There are various quizzes available depending on the needs of your students.