The Tiber (5 letters) and the Liri (4 letters) are two rivers of Central Italy. The Tiber is the longest river in Italy, flowing for 405 miles from the Apennine Mountains to the Tyrrhenian Sea. The Liri is a shorter river, flowing for about 100 miles from the Abruzzo region to the Tyrrhenian Sea. Both rivers are important sources of water for the region and have been used for transportation and irrigation since ancient times.