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Message: <blockquote data-quote="WayneLigon" data-source="post: 2501016" data-attributes="member: 3649">Thanks everyone! Yeah, I had thought about Canyon (Niven's planet where the only breathable atmosphere is at the bottom of miles-deep fissures) and that was what got me to thinking about this. I was also going to use the 'collapsed supervolcano caldera' idea as the basic justification for such a massive area. I was wondering about the air pressure idea for one reason: this is going to be part of an Iron Heroes world I'm building and as part of the fun I was going to use more 'real world' limitations on things. A very warm area despite the bitter cold surroundings with much increased air pressure would give me an area where repillian dragon-like things would live and be able to fly despite their large size (not nearly as large a most D&D dragons but still larger than any Terran creature). The world is going to be generally 'colder' and much drier than Earth so this would be the only consistantly warm area in the explored region. Most of the world will simply be a blank to them. I may still go with that, or just do a more conventional cold (Mongolian-style) desert - not put it nearly as deep as I'd said, use the idea of a thin layer of mist on the ground, litter it with large stone formations and call it The Sea of Stones.</blockquote>