What are the world largest oil spills? The three world largest oil spills are: 1.26 January 1991; terminals, tankers; 8 sources total Sea Island installations; Kuwait; off coast in Persian Gulf and in Saudi Arabia (240.0 millions of gallons); 2.03 June 1979; exploratory well Ixtoc I well; Mexico; Gulf of Mexico, Bahia Del Campeche, 80 km NW of Ciudad del Carmen, Campeche (140.0 millions of gallons); 3.02 March 1992; oil well; Uzbekistan; Fergana Valley (88.0 millions of gallons) (from International Oil Spill Statistics: 1997) [www.cutter.com]