The term ARABIA CHIEF is composed of five crossword solutions: ADEN (4 letters), YEMEN (5 letters), OMAN (4 letters), EMIR (4 letters), and SAUDI (5 letters). ADEN is the former capital of Yemen, which is a country located in the Arabian Peninsula. OMAN is another country in the Arabian Peninsula, and its chief of state is the Sultan. The EMIR is the leader of the United Arab Emirates, a federation of seven emirates located in the Arabian Peninsula. SAUDI Arabia is the largest country in the Arabian Peninsula, and its chief of state is the King.