Answer:
The Tiber River
Step-by-step explanation:
The Tiber provided a reliable source of fresh water. Romans used this water to irrigate their farms, as well as to provide drinking water for humans and animals. However, Rome was not near the delta of the Tiber River. Rome developed about 15 miles from where the Tiber River empties into the Mediterranean Sea, but the Mediterranean sea was salt water so the Tiber river is the only possible answer.