From StrategyWiki, the free strategy guide and walkthrough wiki

• Build a new city on a landform with no water

This is not a real scenario, as there is no specific goal to achieve, but it is listed on the scenario menu and it has the restrictions of a scenario (that is, no bonuses except for the View feature). Despite what you may think at first, it is difficult to achieve a megalopolis even on this water-free landform unless you know what you're doing.