The geography of Rome has been significant in its growth.
Rome is situated by the Tyrrhenian Sea giving it a Mediterranean climate leading to high agricultural activity (especially in olives, grapes, and grain) allowing for the feeding of large civilizations and having enough excess to trade with other nations. This trade with other nations led to contact and Romans improving their agricultural practices with essential tools.
It has seven hills that provide it a protective barrier and is separated by both the Tiber River and marsh lands. The Tiber River allowed for trade that boosted Roman power, prompted economic trade between nations, travel for the Roman military.