While definitely not the largest city on the wasteland planet, Kascalla, Smooth Scar is by far the most ancient.
Originally built as an outpost for farmers and miners, the city serves as a hub that connects all other major cities on the planet as well as provide a safe haven for scavengers to sell their goods.

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Personal work featuring two of my scavenger girls, Ammit and Firelia with their dogs (Or "Dog" in Ammit's case).