Originally posted by Koldamir Wrynn:

Got a huge piece of land cleared and I flattened out the ground, but there are random spots that ether sink down making hole or spots that rise making hills randomly even after fixing it time after time. What's causing this?

the base for the game isnt flat. if you pick down do the base, you will always find it shifting... often the same way as ground level elevation. (mountains tend to have really high base levels).