Saudi Arabia, officially the Kingdom of Saudi Arabia (KSA), is a country in West Asia and the Middle East. It covers the majority of the Arabian Peninsula, with a land area of about 2,150,000 square kilometers (830,000 square miles), making it the fifth-largest country in Asia and the largest in the Middle East. The capital city is Riyadh, and the population is 27 million, including 8.4 million foreign residents.