Geography printables

I just found a free source of printable maps, available as bitmaps or as higher resolution pdf images, at the National Geographic website. You can customise the maps slightly, selecting locations (from world, to continent, to country) and determining the level of detail, including showing country borders or not.

Here it is:
http://www.nationalgeographic.com/xpeditions/atlas/.

I hope it is as useful for you as it was for me. We will be studying animals of the polar regions over the next three weeks in Science, and I have just made a simple do-it-yourself atlas page for the kids on Antarctica, using maps from this site:
I've been looking for something like this for ages.