Mada'in Saleh, also called Al-Hijr or Hegra, is a pre-Islamic archaeological place situated in the Al-Ula sector, within the Al Madinah province of Saudi Arabia. A mainstream of the remnants date from the Nabatean realm, the site comprises the realm's southernmost and leading township after Petra, its capital. Traces of Lihyanite and Roman inhabitation before and after the Nabatean ruling, correspondingly, can also be found in situ, while accounts from the Quran enlightens of an earlier township of the area by the tribe of Thamud in the 3rd millennium BC. In 2008, for its well conserved relics from late ancient times, specially the 131 rock-cut monumental crypts, with their ornately festooned porticos, of the Nabatean kingdom was unearthed.