Al-Faqra Mountains lie west of al-Madinah al-Munawwarah in al-Madinah al-Munawwarah Province , west of the Kingdom of Saudi Arabia, about eighty km from al-Madinah al-Munawwarah. They are a chain of adjacent mountains aligned longitudinally, resembling spinal vertebrae. Their elevation is roughly 1,800 m above sea level. The climate there is mild to cool in summer and extremely cold in winter, to the extent that its inhabitants used to leave during winter for Yanbu Valley, Tasha Valley, and Rah...

The Tuwaiq Mountains Formation , located on the western and southwestern sides of al-Rub' al-Khali (Empty Quarter ) Desert in the Kingdom of Saudi Arabia, is made from limestone. It is considered one of the important geological formations with visible outcrops, representing the oldest formation in the Empty Quarter Desert. In general, the Empty Quarter Desert is the largest continuous desert in the world, covering an area of about 550,000 km². It was formed in a wide, low-lying area dur...