Not to sound all GL, but wasn't this done in the RQ3 Glorantha book? IIRC it had a perfectly servicable overlay of Genertela on North America, which was handy not only geographically, but also climatographically (in a *very* rough sense, and with significant caveats).
AFAIK the width of the wastes was about 750km in both RQ2 & 3. (Sorry, I was going to remake the overlay but I don't have the graphics tools here at work.)
Being from Minnesota, I always thought it a complete gyp that the stinking Ice-Breakers prevented the Lunar Empire from being like my climate (ok, moderated greatly by the sea).
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