I have only seen myself refer to this but I have not had problems in other areas or games.
http://i.imgur.com/XbMiWZR.jpg
When I get close enough for the red beam/lightning to show, hundreds of squares show up and move toward the centre of the mountain and it is massively ugly/distracting.
GPU is 7970, settings in game and panel are high.
Just wondering what it could be, looks like the kind of masking error I have seen on low spec graphic cards in the past when loading too many transparent objects but I severely doubt a 7970 would struggle with this.