This is a .raw file which is used in many virtual worlds. It is the heights and depths of the elevations of a region. Awwww...so sweet!! @ 19 meters depth, this raw not only sends your sweetie a message, but allows you to add much underwater. Some hills added for a variety of elevations. The terrain textures are just my current that I like...much can be changed to the look by changing textures and adjusting their numbers.