Qasr al Bint, “Palace of the Daughter or Maiden,” is the largest tomb façade at Mada'in Saleh, with a height of 16 m. It lends its name to the group of adjacent tombs.
In the middle of the Jebel Ithlib is a natural slit that measures 40 m (131 feet), called the Siq, after a similar corridor at Petra.