There are several storylines that could use a forest with tents and weirwood trees and the occasional shack, but the fake snow (bagged and on the ground) again points to scenes beyond the Wall.
picha
Game of Thrones
season 3
set picha
clandeboye estate
This Game of Thrones picha contains
beech, beech mti, mti beech, kuishi mwaloni, live oak, mahogany, and mahogany mti.