What country is borded by the Arabian Sea and Gulf of Oman ruled a monarch called sultan?

The country bordered by the Arabian Sea and Gulf of Oman and ruled by a monarch called sultan is Oman. Oman is a country located in the southeastern coast of the Arabian Peninsula, with a coastline stretching along the Arabian Sea and the Gulf of Oman. The country is ruled by Sultan Haitham bin Tariq Al Said, who has been the reigning monarch since 2020.