You could say the Mediterranean Sea, as Rome controlled all the territories around it. Although it was not in the center of the empire geographically, it was Rome's central body of water used for trade, travel and troop movement.
Germany.
United Empire: Rome Western Empire: Rome then Ravenna Eastern Empire: Constantinople
If you look at a map, you will see that Rome itself is nowhere near the Mediterranean sea. The closest sea to Rome is the Tyrrhenian Sea and that is fifteen miles away from the city of Rome. Rome did benefit from controlling the lands around the Mediterranean both for commerce and defense. Greece, although surrounded by seas, has only a small part of the country (the Peloponnese) directly on the Mediterranean. It is otherwise surrounded by the Aegean and Ionian seas. The Greeks made use of their seacoasts as the Romans did for trade and especially for defense, as the Greeks were a great seafaring people who could produce a formidable navy.
Timbuktu was the major center for Sub-Saharan trade.
The modern country of Peru was the center of the Inca empire.
The country that the Modern Media Center is found is China.
You could say the Mediterranean Sea, as Rome controlled all the territories around it. Although it was not in the center of the empire geographically, it was Rome's central body of water used for trade, travel and troop movement.
Peru
The center of Inca civilization was in the region of Cusco, located in modern-day Peru. Cusco was considered the capital of the Inca Empire and served as the political, cultural, and religious center of the civilization.
"Center" referring to the capital of the Safavid empire: Tabriz, Qazvin, and Isfahan were all the capital of the Safavid empire at different points in its existence. Tabriz is located in the current East Azerbaijan Province. Qazvin is the current capital of the Province of Qazvin. Ishafan is the current capital of Isfahan Province. All are within the modern country of Iran.
Turkey.
The political center of the Byzantine Empire was in Constantinople but the empire itself encompassed the Mediterranean area including Spain, Turkey, Egypt, Italy, and parts of the Middle East.
The city that was once the center of the Mali empire and became the center of the Songhai empire was Gao
The capital of Cyprus is Nicosia. It is the largest city in the country and serves as its political and administrative center.
Italy's location in the centre of the Mediterranean Sea, between it western and eastern basins, meant that the empire first grew around this sea. The Romans conquered the whole of the Mediterranean and called it mare nostrum, 'our sea.' It also influenced the fact that Gaul was the first land beyond the Mediterranean they conquered. They expanded northwards from their possession along the Mediterranean in southern Gaul.
The center of his Empire was Babylon.