In essence, a flap map is just an outline map with titled text boxes scattered around at key points. The students then color-code the map according to a self-made key. I then send them a second document with text boxes in the same arrangement as the titled text boxes on the map page. When the students have finished with the initial sheet, they fill in key facts about each of the named sites. When the fact sheet is printed, it will line up perfectly with the map boxes. The students can then cut out three sides of each text box on the map page.
Once the students have glued the fact sheet to the back of the map page, the map text boxes are now "doors" or "flaps" that can be opened and closed. When opened, the facts from underneath are revealed for studying. The map can also easily fit into student binders and folders for quick reference later!
Below are some images of the Word templates I created, as well as a few pictures of the finished maps.