The Suez Canal.
Catapults were common over most of the Western world and around the Mediterranean.
The Finnish have not ruled over the Eastern Mediterranean.
Panama Canal
Elimination of its rival power gave it control over the western Mediterranean.
A reservoir is made by damming a river or other waterway and controlling the output. Reservoirs are often constructed to provide water for towns, to provide a place for recreations, and to provide more control over a river that causes damage when it floods.
Over 2,000 independent city-states spread around the Mediterranean, Aegean and Black Sea littorals.
The Romans gradually took over all the lands on the coast of the Mediterranean and controlled the whole of it.
It became dominant in the Western Mediterranean, and then became embroiled in the Eastern Mediterranean.
Suez Crisis.
You see, German hegemony over most of continental Europe; Italian hegemony over the Mediterranean Sea; and Japanese hegemony over East Asia and the Pacific made them partners in crime.
The Western Mediterranean.