A small outline of Mars' single continent in the Steamoperaverse.
Like the Venus maps, based on Mars's topology with some artistic license.
Mars in the Steamopera is: Cold. The plant-life native to Mars (though part of the Terran biosphere, like Venus) uses red cholorophyl instead of green, and thrives under snow and ice.
The inhabitants of Mars are the Great Apes, a tall and shaggy primate species that uses sign-language for their primary communication, and have split personalities (roughly).