Saudi Arabia (Arabic: السعودية as-Su‘ūdiyyah or as-Sa‘ūdiyyah), officially known as the Kingdom of Saudi Arabia (Arabic: المملكة العربية السعودية al-Mamlakah al-‘Arabiyyah as-Su‘ūdiyyah Arabic pronunciation ), is the largest Arab state in Western Asia by land area, constituting the bulk of the Arabian Peninsula, and the second-largest in the Arab world, after Algeria. It is bordered by Jordan, and Iraq on the north and northeast, Kuwait, Qatar, Bahrain and the United Arab Emirates on the east, Oman on the southeast, and Yemen on the south. The Red Sea lies to its west, and the Persian Gulf lies to the east. Saudi Arabia has an area of approximately 2,250,000 km2 (870,000 sq mi), and it has an estimated population of 27 million, of which 9 million are registered foreign expatriates and an estimated 2 million are illegal immigrants. Saudi nationals comprise an estimated 16 million people.