Al Jubayl, industrial city and port city in Saudi Arabia, located in Ash Sharqiyah Province on the Persian Gulf coast, 100 km (60 mi) northwest of Ad Dammam. A planned industrial city, Al Jubayl contains an oil refinery, a steel mill, and one of the world's largest desalination plants, which also generates electric power. In addition to refined oil products and steel, petrochemical products such as plastics and fertilizers are manufactured and exported. Other industries were created to manufacture consumer goods and support the activities of the primary oil- and gas-based ventures.
Al Jubayl is one of Saudi Arabia's most important ports. It is also the site of a major naval base, which played a key role in the movement of military personnel and equipment in the Persian Gulf War (1991). A huge oil spill in the Persian Gulf during the war affected civilian and industrial water supplies in Al Jubayl and impacted the local fishing industry.
