Saudi Arabia, officially known as the Kingdom of Saudi Arabia (KSA), is an Arab state in Western Asia constituting the bulk of the Arabian Peninsula. With a land area of approximately 2,150,000 km2, Saudi Arabia is geographically the fifth-largest state in Asia and second-largest state in the Arab world after Algeria. Saudi Arabia 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, and Yemen to the south. It is separated from Israel and Egypt by the Gulf of Aqaba. It is the only nation with both a Red Sea coast and a Persian Gulf coast, and most of its terrain consists of arid desert or barren landforms. The land of the present-day Saudi Arabia is encompassing most of the Arabian Peninsula, the birthplace of Islam and Arabs, and sometimes called "the Land of the Two Holy Mosques" in reference to Al-Masjid al-Haram, and Al-Masjid an-Nabawi in Medina, the two holiest places in Islam. The King’s title is Custodian of the Two Holy Mosques. Arabic is the exclusive official language in Saudi Arabia.