Saudi Arabia was first established in the early 18th century, and modern Saudi Arabia was founded in 1932 by King Abdul Aziz. It is the largest of all nations in the region, occupying approximately 863,730,000 square miles in the central Arabian Peninsula. It is bordered by the Red Sea, the Indian Ocean, and the Arabian Gulf. It has a population of 17 million people, of which about 4 million are noncitizens. All Saudi Arabians are Muslims and nearly 98% are Arabs who are bound together by their common mother tongue Arabic, strong family and tribal relationships, and adherence to Islam.