Indeed the towers and the bridge are not my creations. I have just done simple modifications to fit them into this map. The credit goes to the artists in Dundjinni. I tried to create the towers myself, but the results were so poor and you would have got good laughs (I sure did...right after I had stopped crying).

The terrain elevation is a created using a gray scale 2D heightmap and then applying several layers of various textures on top of it. I use Geocontrol to create the heightmaps and save them as normal bitmaps (as I'm no pro on geocontrol I tend to create several heighmaps and use only the best parts of them). I also tried to create the heightmap for the chasm, but failed constantly, so I created it manually by drawing using standard black brush with low opacity.