According to Jon P (see here), there's no writing to the SE of the eastern lake, just a squiggle (I think text bleedthru made me think it was writing). However, the dot is actually an asterisk, so it was presumably meant to mark something. Since stars on maps are often capitals, it could be the seat of the Great King mentioned in the accompanying article, but that's just a guess.
Last Edit: Apr 14, 2013 22:39:30 GMT -6 by Zenopus
If there is still a question of scale on the aforementioned maps, here may be a clue.
From Wargaming #2 in 1977, The Three Artifacts of the Demon Senders by Robert J. Kuntz mentions...
"Ages ago, beyond reckoning, there were brought in the bowels of the earth deep beneath what is now the ancient Great Kingdom, nearly 400 miles north of the castle Greyhawk, a set of powerful artifacts dealing with the demons and the elements."
400 miles from the Great Kingdom to Castle Greyhawk! Time to break out the rulers!