5. The valley: Wad-il-Qura, where the Thamud carved out dwellings in the mountains, and probably in history they were the first people who started cutting out such buildings into the rocks. (For details, see (E.Ns 57, 59 of Surah Al- Aaraf); (E.N. 45 of Surah Al-Hijr); (E.Ns 95, 99 of Surah Ash- Shuara).