As a result of military occupation and civil unrest, the official statistics have not been revised since 2001 and are largely based on 2-D seismic data from three decades ago. International geologists and consultants have estimated that unexplored territory may contain vastly larger reserves. The majority of Iraq's proven reserves of oil comes from the following cities: Basra (Being #1), Baghdad (Being #2), Ramadi (Being #3), and finally, Ba'aj (Being the last oil rich city).[4]