Located on this website, under CRESTek Links, is a collection of geography games. Students/teachers can select from 20 different games.  Not only do many of these games build student understanding of the United States, its rivers, lakes, and regions, but they also help students practice their navigation skills using the arrow keys to move left/right or up/down to enlarge or reduce. Many states must be dragged and dropped into their correct position on the map.  This video demonstrates several of the games.