To be more specific, second unit on Episode VII are filming in (or near) Al Gharbia. If I had to guess, I’d say they’re most likely shooting in the desert outside the Liwa Oasis. Take a look at this photosphere if you want confirmation that they’re filming scenes set on Tatooine, or check out some of these images below:
If you want to see for yourself, here’s a map of the general region:
This all originated with a tweet noting that geolocation was turned on for the already-iconic Episode VII clapperboard photo:
So there you have it. At the very least, the scenes shot there should be spectacular.