"Measuring from just south of Wilmskirk to the edge of Snakepipe Hollow, Sartar is approximately 125 miles, and from the Marsh to the edge of Prax, about 100 miles." and also: "The breadth of the Lunar Empire is supposed to be approximately 1000 miles by 1000 miles."
This is the guide I have used on maps since then e.g. at http://www.halberdgames.com/Glorantha.htm
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