安巴尔省
Wadi al-Abyad or al-Ubayyid (Arabic: وادي الأبيض, "white wadi") is the second-longest wadi in Iraq (after Wadi Hauran) and extends in west of Iraq within Al Anbar Governorate and Karbala Governorate. It runs for roughly , from Iraqi-Saudi border (near Arar) in Al Anbar Governorate till Lake Razazah in west of Karbala Governorate. It is wide, deep.