This is part 3 in the terrain modelling tutorial with blender. This covers another slightly different method to make the terrain, in that I make the main terrain by using some simple sculpting techniques. I was just experimenting with this. It didn't turn out too well though, I might make another video trying to solve problems in this video
You can check out other parts of this video by checking these links --
Part 1 - • Blender terrain tutorial 1
Part 2 - • Blender terrain tutorial 2