The Liri (Latin Liris or Lyris, previously, Clanis; Greek: Λεῖρις) is one of the principal rivers of central Italy, flowing into the Tyrrhenian Sea a little below Minturno under the name Garigliano.
The Liris source is in the Monte Camiciola, elevation 1,701 metres, in the Monti Simbruini of central Apennines (Abruzzo, comune of Cappadocia). It flows at first in a southeasterly direction through a long trough-like valley, parallel to the general direction of the Apennines, until it reaches the city of Sora.
In the upper part of Isola del Liri it receives the waters of Fibreno and then it divides into two branches which then rejoin, surrounding the lower part of the town (Isola del Liri stands for Liri Island). One branch makes a 28-metre high waterfall situated in the centre, a unique case in Europe.
A dam is built on the river after the confluence with the Sacco at Ceprano. The last important Liris tributary is the Melfa, with which it joins near Aquino. After Cassino it receives the waters of the Gari, and afterwards it is known as Garigliano.
The Liri-Garigliano system has a total water drainage basin of 5,020 square kilometres.
