I was playing and this just occured to me. If you can create  and destroy land, create and destroy mountains then why is it you can not create rivers and forests?

If a spell to create a forest or river was possible it would be a solution to the upcoming single tile city changes. This would give the player the ability to bring the resources to the city instead of sprawling towards the resource. Forests and rivers would also help to create lost bottlenecks due to the removal of the sprawling cities. It would also help keep maps form being barren once the sprawling is removed.