The Omani Empire was a maritime empire, vying with Portugal and Britain for trade and influence in the Persian Gulf and Indian Ocean. After rising as a regional player in the 18th century, the empire at its peak in the 19th century saw its influence or control extend across the Strait of Hormuz to modern-day Iran and Pakistan, and as far south as Cape Delgado. After the death of Said bin Sultan in 1856 the empire was divided between his sons into two sultanates, an African section ruled by Majid bin Said and an Asian section ruled by Thuwaini bin Said.

A thalassocracy or thalattocracy, sometimes also maritime empire, is a state with primarily maritime realms, an empire at sea, or a seaborne empire. Traditional thalassocracies seldom dominate interiors, even in their home territories. Examples of this were the Phoenician states of Tyre, Sidon and Carthage; the Italian maritime republics of Venice and Genoa of the Mediterranean; the Chola dynasty of Tamil Nadu in India; the Omani Empire of Arabia; and the Austronesian empires of Srivijaya and Majapahit in Maritime Southeast Asia. Thalassocracies can thus be distinguished from traditional empires, where a state's territories, though possibly linked principally or solely by the sea lanes, generally extend into mainland interiors in a tellurocracy.