Khand: What kind of geography is it? From their breif description, they sound like Mongols, or other central asian nomads on horseback.
Rhun: This land that two wizards dissapeared into. What sort of temples and cities are here? Only Aragorn and Suruman could answer.
Harad: Land of Mumakil. Are their any ports or cities similar to the Swahilii city-states? If the Mumakil are here, what other sabertoothed cat or ape could one find in the desert or jungle?
Upper Misty mountains, Mts of Angmar/Carn Dum, Grey mountains: Gundaband? How grand is it compared to Khazad-dum? Could stand on a precipice on the grey mts, and look north to a tundra, and turn around to see a forest? Dragons bred there? How do dragons breed?
These land on the extremes of the map interest me so much.
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