Introduction of Tiber-River
River of central Italy, 250 mi long, rising in the EtruscanApennines and flowing S through Tuscany,Umbria, and N Latium, then SW through the city ofRome to the Tyrrhenian Sea. Subject to severe floodinguntil modern times, it was used in the fifth centuryb.c. for shipping grain. During the Punic Wars inthe third century b.c. the Romans built a naval baseat Ostia on the lower Tiber that was greatly improvedduring the Roman Empire, but the port was eventuallyrendered unusable by silting. In the 1970s siltingstill prevented ships from passing beyond Rome.