- SE coastal region of Arabia, on the Arabian Sea
- country in this region: an independent sultanate: 119,499 sq mi (309,500 sq km); pop. 2,070,000; cap. Muscat
- arm of the Arabian Sea, between Iran & Oman in Arabia: c. 350 mi (563 km) long
Formerly Mus·cat and Oman
A sultanate of the southeast Arabian Peninsula on the Gulf of Oman, an arm of the Arabian Sea. Much of the area was controlled by the Portuguese from 1508 to 1650 and the Turks until 1741, when the present royal line was founded. Oman established close ties with Great Britain in the late 1700s. Muscat is the capital.