Mapping Barsoom...Some Handy Articles at the ERBzine site

Burroughs’ Barsoom and Lowell’s Mars:
A Map for the Interpretation of Barsoomian Geography
by Leathem Mehaffey
http://www.erbzine.com/mag14/1438.html

Seven Wonders of Barsoom
by Woodrow Edgar Nichols, Jr.
I: The Pumping Stations (http://www.erbzine.com/mag33/3308.html)
II: The Twin Cities of Helium (http://www.erbzine.com/mag33/3307.html)
III: The Hot House Cities of Okar (http://www.erbzine.com/mag33/3306.html)
IV: Kamtol in the Valley of the First-born (http://www.erbzine.com/mag33/3305.html)
V: The Hidden Cities in the Forest of Lost Men (http://www.erbzine.com/mag33/3304.html)
VI: The Field of Jetan at Manator (http://www.erbzine.com/mag33/3303.html)
VII: The Temple of the Sun (http://www.erbzine.com/mag33/3302.html)

There are more than 14 additional alternate and runner-up Wonders of Barsoom detailed in a follow-up series of articles listed at: http://www.johncarterofmars.ca/articles.html

This is great stuff, especially if you're at all curious about Barsoom's topography, or would like to build a usable map of Barsoom for gaming or even a bit of fiction...like for the forthcoming Heroes of Mars project...from Pulp Empire...