This is a .raw file which is used in many virtual worlds. It is the heights and depths of the elevations of a region. I had created this originally in a grid for my Arrakis region I once had there. In this version I have updated it for more general use. The concept is one of Dunes through most of the region...rolling hills and paths at various heights. As you can see a little more than a 1/4 offers some water. I previously had higher walls but smoothed them down for this. Walking this is quite nice and there are all sorts of places to set out a Home and/or other misc things.