Being close to the Tyrrhenian Sea, Rome experiences a Mediterranean climate.Rome is popularly called 'the city of seven hills'. These seven hills namely, Viminal, Quirinal, Palatine, Esquiline, Capitoline, Caelian, and Aventine were separated by marshy land and the River Tiber.
theese are some of the things about romes geography, theese things helped because romans could trap invaders into the hills, and it would make it harder for them to escape. thats all i know
i hope all the info i gave you helps!