The Eastern Province encompasses the entire east coast of Saudi Arabia and acts as a major platform for most of the kingdom's oil production and exports. Oil was first found in the country in the Eastern Province, at the Prosperity Well site (formerly known as Dammam No.7). The Ghawar oil field, located in the Ahsa Governorate, measuring 8400 sq.km. (3240 sq.mi.) is the largest oil field in the world, and accounts for roughly a third of the kingdom's oil production. The Safaniya oil field, located off the coast of the province, is the largest offshore oil field in the world. The Jubail Industrial City, part of the city of Jubail, the fifth most populous in the province, is the largest industrial city in the world.