Barsoom is a world of twin elemental extremes. At one pole is the land of Barish, a world of deserts and badlands with long, scorching hot days and short, sweltering nights. Its native inhabitants are the Majnun, who built a mighty civilization out of bronze and stone along the banks of the Mud River. Their endlessly warring city-states were only united when they were conquered by the Flametongue legions. Under their rule, the cities have been forced into relative peace and trade in salt, gold, and slaves.
At the opposite pole is Somah, a frozen land of tundra, mountains, and icy seas. The hidden Ivaldi and their Warforged lived in kingdoms deep under the earth, until the Hoarfrost legions came and Krysophax the White, Eldest of his Shade, cracked open the Whitewall Mountains and forced their kings to submit. Imperial settlements can be found in mountain valleys, foothills and other pockets of fertile land. The scattered Goliaths occasionally trade or settle peacefully among these people.The Olthar are the most widespread humanoids outside the mountains. Their chieftains alternate between raiding Imperial villages and paying tribute.