In the extreme north, dates, limes, nuts, bananas, alfalfa, and vegetables are cultivated, and in the southwest there is an abundance of camels, cattle and other livestock. Fishing is an important industry. The major product, however, is oil, which was discovered in Oman in 1964 and first exported in 1967. Crude oil is produced and refined; other industrial products include natural gas, copper, steel, chemicals, and optic fiber. Petroleum, reexported goods, fish, metals, and textiles are important exports; imports include machinery and transportation equipment, manufactured goods, foods, livestock, and lubricants. Oman has a large trade surplus. The main trading partners are Japan, the United Arab Emirates, China, and South Korea.