The Arabian Sea is part of the Indian Ocean. In the northwest, it is connected to the Gulf of Oman, which in turn has a connection to the Persian Gulf; in the southwest, there is access to the Gulf of Aden, which flows into the Red Sea. Thus, the Arabian Sea covers an area of about 3.86 million km². Its deepest point is 4,652 m below the water surface. It is fed by the Indus and Sharavathi rivers. Adjacent countries include India, Oman and Pakistan, as well as Iran and the Arabian Peninsula. Major coastal cities on the shores of the Arabian Sea are Mumbai and Karachi, cities with over a million inhabitants.