Arabian Sea, that part of the Indian Ocean lying north of an imaginary line stretching between Cape Comorin, the southernmost point of Hindustan, and Cape Guardafui, the most easterly point of Africa. The sea proper lies between Hindustan and Arabia; but the Gulf of Aden, with its extension, the Red Sea, and the Persian Gulf are arms of the Arabian Sea. Ships passing through the Suez Canal must cross the Arabian Sea to reach southern Asia. Bombay is the chief port on the Arabian Sea. The chief islands are Sokotra and the Laccadive Islands.