These are 12 rendered very basic landscapes, 3000x3000 pixels across-- so they will fit nicely into Daz Studio's background slot (see promo pictures 9 and 10 in the MP to see where the controls are, to load backgrounds into Daz Studio and into Poser 11.)
A great companion product is Richardphotos and Mapps "LAF Lands and Forest" set, also in the Renderosity Marketplace. It will provide you with a "floor"
for your characters, as well as added trees and shrubs.
https://www.renderosity.com/mod/bcs/laf-lands-and-forests/115926/
Shaara Muse also has wonderful rocky sets that would add to these images and fill out your natural scenes.