Chief Arabia is a term used to refer to the leaders of the five countries in the Arabian Peninsula: ADEN, Yemen, OMAN, EMIR, and SAUDI Arabia. ADEN is a port city located in the south of Yemen, while Yemen is a country located in the Middle East. OMAN is a country located on the southeastern coast of the Arabian Peninsula, and EMIR is a title given to the leader of a Muslim state. Finally, SAUDI Arabia is a country located in the Middle East and is the largest country in the Arabian Peninsula.