The terrain is self made and the material used from High Resolution Terrains 2 & 4 (available at Daz 3D). The small lake is a 2D-Disk, the waterfall consists of three terrains and the water is yet another terrain. Everything with self made materials. Ambient light by a bit of Sky Dome and the WhiteSphere HDRI, the key light by the sun. A small waterfall splashes into a lake.