There is a very nice Dying Earth map at the Spatterlight Press website: (about two-thirds of the way down the page). The map is by Madanjeet Singh Sandhu, and while it is not based (so far as I know) on anything by Vance himself, it is pretty accurate and very pretty to look at. There is also a version of the same map with Esperanto texts by that indefatigable vancean and esperantist Gan Uesli Starling.

There is a great deal of other graphic material at the site, well worth a surfing expedition.