Official names for Arctic and Plains regions?

[Maldin]

Also from Greyhawk:

Plains: Dry Steppes, Zeif, Plains of the Paynims

Also, Stonehold, Ice Barbarians, and the Barren Wastes are pretty much sub-arctic.

Denis, aka "Maldin"
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[Simm]

Arctic: If you go far enough north, ice cap, ice field, and glacier