Qatar is largely barren, flat desert. Water is scarce, and agriculture is minimal. Once a nomadic society, Qatar now has little rural population. Doha, the main urban center, is on the eastern coast of the peninsula. About 40% of the inhabitants are Sunni Arabs of the Wahhabi sect of Islam. There are Christian and other minorities. Other ethnicities include South Asians, Iranians, and Palestinians. Less than one fifth of the population are native Qataris; most of the workers associated with the important oil and gas industries are foreigners. Arabic is the official language, although English is widely used.