This is reputed to be Edgar Rice Burroughs' first map of Barsoom. Since this map was created there have been multiple attempts to map Barsoom from various writers and publishers telling stories on Barsoom.
Edgar Rice Burroughs drew crude maps to locate his John Carter's adventures, but he was not a cartographer. Moreover, his work constitutes entirely a second hand account. He was not the source, rather, he related tales told by John Carter. Accordingly, as a dedicated and prolific scribe, he may be forgiven for the occasional error.
In the 1940's a substantially more elaborate map was drafted, intended to overlay ERB's Barsoom over the map of Mars as it was known then. That original Map of Mars has turned out to be highly inaccurate, and so the superimposition of Barsoomian locations must be taken as equally inaccurate. In fact, the most compelling thing about the 1940's map is that it was an attempt, and it was clearly ERB’s intention to superimpose Barsoom onto Martian geography. ~ Den Valdron from the Geographers of Mars Series
Since this first map, many more fanciful maps have been draw and created and even though the original mapping of Mars to Barsoom is considered to have been a failure, it did not stop writers from creating new maps and imagining new tales on Burrough's Barsoom.