Al-Manifa is a mountain located 20 kilometers north of Ajnuna near Wadi al-Hrob in north western Saudi Arabia. On the basis that Hrob is a corruption of Horeb, in the early 20th century Alois Musil and H. Philby independently proposed that Al-Manifa was the Biblical Mount Sinai.

Manifa is having oil reserves of 11 billion barrels. Huge development work is in progress this area to support the extraction of oil.