2 things many other people seem to have complications with: mountain formations and forestry, probably because they're the hardest.
As you know, mountains are formed by plates colliding and volcanoes (and are modified by erosion of the basic elements). To me, it just doesn't make sense to see a little piece of a continent surrounded by mountains, true mountain formation occurs more in water, but to me, it just seems unlikely. And the forestry seems slightly displaced, I'd think a forest wouldn't grow very close to a desert like in the bottom continent. That, and the the lack of varied vegetation. However, I must admit though, I'm no geographical expert. This is just my opinion. =P
Oh, and the fire effects are cool, but they're burning a stone bridge...