Exact population: 27,019,731 note: includes 5,576,076 non-nationals (July 2006 est.) Literacy: Total population: 78.8%; male: 84.7%; female: 70.8% Ethnicities: Arab 90%, Afro-Asian 10% Land boundaries: Total: 4,431 km; border countries: Iraq 814 km, Jordan 744 km, Kuwait 222 km, Oman 676 km, Qatar 60 km, UAE 457 km, Yemen 1,458 km Terrain: Mostly uninhabited, sandy desert Extremes: Lowest point: Persian Gulf 0 m; highest point: Jabal Sawda' 3,133 m Imports: US 15.3%, Japan 9.8%, Germany 8.1%, China 6.6%, UK 5.7% (2004) Exports: US 18.2%, Japan 14.9%, South Korea 9.5%, China 6.1%, Taiwan 4.5%, Singapore 4.1% (2004) Industries: Crude oil production, petroleum refining, basic petrochemicals, ammonia, industrial gases, sodium hydroxide (caustic soda), cement, construction, fertilizer, plastics, commercial ship repair, commercial aircraft repair