Dumat al-Jandal, also known as Al-Jawf or Al-Jouf, which refers to Wadi Sirhan, is an ancient city of ruins and the historical capital of the Al Jawf Province, today in northwestern Saudi Arabia. It is located 37 km from Sakakah.

Wadi Sirhan is a wide depression in the northwestern Arabian Peninsula. It runs from the Aljouf Oasis in Saudi Arabia northwestward into Jordan. It historically served as a major trade and transportation route between Syria and Arabia. From antiquity until the early 20th century, control of Wadi Sirhan was often contested by various Arab tribes. The valley is named after the Sirhan tribe which migrated there in the mid-17th century.