- SE coastal region of Arabia, on the Arabian Sea
- country in this region: an independent sultanate: 82,031 sq mi (212,460 sq km); cap. Muscat
- arm of the Arabian Sea, between Iran & Oman in Arabia: c. 350 mi (563 km) long
Formerly Mus·cat and Oman
- Country in the Middle East. Official name: Sultanate of Oman.