This site is good, especially for those who have an interactive whiteboard, or for students with access to computers. A kind of DIY GIS / map sketching thing …

gmOrZ_pVmW

… just click on the x on the info panel that pops up when you arrive on the site and explore, using the drawing tool bar at the top. The fact that your scribbles on maps can be saved has all kinds of potential too: http://www.scribblemaps.com/.