Saudi Arabia (i/ˌsaʊdi əˈreɪbi.ə/ or i/ˌsɔːdiː əˈreɪbi.ə/; 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 (help·info)), is the largest Arab state in Western Asia by land area (approximately 2,250,000 km2 (870,000 sq mi), constituting the bulk of the Arabian Peninsula) and the second-largest in the Arab world (after Algeria). It is bordered by Jordan and Iraq to the north, Kuwait to the northeast, Qatar, Bahrain and the United Arab Emirates to the east, Oman to the southeast, Yemen in the south, the Red Sea to the west and Persian Gulf to the east. Its population is estimated to consist of 16 million citizens and an additional 9 million registered foreign expatriates and 2 million illegal immigrants.