The 450 extras being recruited out of Spain likely means that at least one of the armies will be out of King’s Landing or Dorne.
Casting reports indicate that Game of Thrones is looking to bring in 450 extras to participate in a Season 7 battle.
Filming for the battle will take place in Spain, which means that the fighting will likely take place in the southern regions of the Seven Kingdoms.
Spain previously stood in primarily for Dorne while Croatia doubled as King’s Landing, but Spain will reportedly host most of the filming for the southern regions of Westeros in Season 7.