The Cetina is part of the Adriatic basin and is 105km long. It flows into the Adriatic Sea near the town of Omiš.
The Cetina springs at an altitude of 385m on the northwestern slopes of Dinara near the village of Cetina, 7km north of Vrlika, after which the river was named. The source of the Cetina is a lake over a hundred metres deep.
Near Vrlika there is Peruća Lake, artificially created by a dam 25km downstream on the river Cetina. Past the lake, the river flows through the karst area and Sinjsko polje towards the town of Sinj. The Cetina leaves Sinjsko polje under Gradun, near the town of Trilj, and flows into the canyon towards the south. Above the canyon, there is the Nutjak fortress. The banks near the canyon and the river is deep and slow. Once upon a time, the waters flowed quickly and powered many mills, but the dams have slowed them down. The Cetina turns to the southeast near Bisko, and is followed by the A1 motorway from there. It turns south near Šestanovac, passes under the A1, and soon turns around Mosor near Zadvarje and continues westward. It flows into the Adriatic Sea in Omiš.
Source: TZ Trilj
