The terrain of Iceland is depicted in the sim as mountainous - there are no totally flat areas.
The ground texture is simple. I imagine this decision was taken to keep the frame rates up... anyway the effect of speed at low level is amongst the best I've experienced, and bear in mind that I was flying the sim on my Celeron 466 Mk II system - decidedly a low - end sim rig!
Because the terrain in this sim actually blocks radar signals the terrain becomes an important tactical consideration.
Terrain from 500 feet
Terrain from 5,000 feet
Terrain from 20,000 feet
Click the pictures for a bigger image