Maps!

[Diamond]

Are you talking real world or fantasy? If real world, the link Sapiento provided is probably the best; that's got so much stuff in it by now that it'll probably take you days just to look through it all.

If you had fantasy maps in mind, you can actually create your own base maps fairly easily if you have photoshop or an equivalent. Just use the Clouds filter, then adjust the contrast down to a sharp black and white, and you should have a nice spread of 'continents' and 'islands' which you can then mash up and move around at your leisure.

[Redrobes]

Check out the finished map sections with the thumbnails thread and if you like some of them, check the usage policy or contact the poster.

We have a CWBP - Community World Building Project where we have mapped a large area and have wiki descriptions for most of the places. Thats CC licensed with NC-BY-SA so pretty liberal and no problem for VTT style playing.