Hi, Axelan. It's not real. The canyon appears to be a matte painting on glass superimposed over a background plate (filmed in the Tabernas desert of Almeria, Spain).
Either that or the entire terrain is a painting. Many Spanish fans have scoured the area and found pretty much every location but I've yet to see anybody identify these particular mountain ranges.
If this wasn't done by matte artist, Yusei Uesugi, then I'd like to know who painted it.