The Arabian Sea is a region of the northern Indian Ocean bounded on the north by Pakistan and Iran, on the west by northeastern Somalia and the Arabian Peninsula, and on the east by India. Historically the sea has been known by other names including the Erythraean Sea and the Persian Sea. Its total area is 3,862,000 km2 (1,491,000 sq mi) and its maximum depth is 4,652 metres (15,262 ft). The Gulf of Aden is in the southwest, connecting the Arabian Sea to the Red Sea through the strait of Bab-el-Mandeb, and the Gulf of Oman is in the northwest, connecting it to the Persian Gulf.
The Arabian Sea has been crossed by important marine trade routes since the third or second millennium BCE. Major seaports include Jawaharlal Nehru Port in Mumbai, the Port of Karachi and the Gwadar Port in Pakistan and the Port of Salalah in Oman. Other important ports include in India, Kandla Port, Jawaharlal Nehru Port, Kochi, Mumbai Port, and Mormugao in Goa. The largest islands in the Arabian Sea include Socotra (Yemen), Masirah Island (Oman), Astola Island (Pakistan) and Andrott (India).
Bahr al-Arab (also called the Kiir River) is a river which flows approximately 800 kilometres (500 mi) through the southwest of Sudan and marks part of its international border with South Sudan. It is part of the Nile river system, being a tributary of Bahr el Ghazal, which is a tributary of the White Nile.
The river flows through Sudan's Kurdufan and Darfur regions and forms part of the border between Darfur and the region of Bahr el Ghazal in northwestern South Sudan. For centuries the Bahr al-Arab has marked the boundary between the Dinka and Baggara ethnic groups. The river has served as a frontier and zone of conflict between the Baggara and Dinka peoples as long as their oral traditions remember.
The name "Bahr al-Arab" is Arabic for "Sea of the Arabs" (possibly from "Nahr al-Arab", Arabic for "River of the Arabs"). The Dinka people call it the "Kiir River".
The Bahr al-Arab arises from several tributaries that drain the Bongo Massif and Marrah Mountains in Darfur, close to Sudan's border with Chad and the Central African Republic. The Adda and Umbelasha flow east from the Bongo Massif to join the Ibrah (Wadi Ibra), which flows south from the Marrah Mountains. Formed from these tributaries, the Bahr al-Arab flows east along the border of the Darfur and Bahr el Ghazal regions, then through a southern part of the Kurdufan region.