I am wondering if it is possible (in theory) to flat any cliff...
I kinda thought it is (or at least should be ^^) possible but anyway I am struggling at this one:

I can't higher the lowest point because of the cliffs left and right, neither i can make those cliffs dissappear because of some points close to them are too high.
But i cannot lower thos high spots because of the high part of it... I can't higher the highes part because I can't stand there and can't make me stand there
because I cannot add anymore dirt because of the lowest point...
It seems like: I can't higher the lowest point because of the highes point and vice versa :O
Would appreciate any suggestions ^^