You'd have to come up with some very complicated reason to explain why people would prefer living on the ocean instead of just hanging out at the seaside, and if there's water then there can't be a Mad Max like desert by definition.
You'd have to come up with some very complicated reason to explain why people would prefer living on the ocean instead of just hanging out at the seaside, and if there's water then there can't be a Mad Max like desert by definition.