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Sicily Dirillo.jpg
Country Sicily: provinces of RagusaCaltanissetta and Catania
Physical characteristics
 • location Iblei mountains, near Vizzini
 • elevation 986 m (3,235 ft)
Mouth Mediterranean Sea
 • location
Strait of Sicily, south-east of Gela
 • coordinates
37.0025°N 14.3374°ECoordinates37.0025°N 14.3374°E
 • elevation
0 m (0 ft)
Length 54 km (34 mi)
Basin size 739.39 km2 (285.48 sq mi)

The Dirillo, or Acate, is a 54-kilometre (34 mi) river in Sicily which springs from the Hyblaean Mountains and flows through the areas of VizziniLicodia EubeaMazzarroneChiaramonte GulfiAcateVittoriaGela. It enters the Strait of Sicily south-east of the town of Gela. As the largest river in the area it is sometimes known as the Fiume Grande.

The river was known in antiquity as the Achates (Ancient GreekἈχάτης). It was noted by Silius Italicus for the remarkable clearness of its waters.[1] Theophrastus in his treatise On Stones (ca. 315 B.C.) indicates that the name of the gemstone achates (agate) was based on the source of such stones from this river.[2] Pliny the Elder makes the same connection in his Naturalis Historia[3] Agate and chalcedony can still be found here. During the period of Arab rule it became known as Wadi‑Ikrilu: ‘The River of Acrille’, an ancient Greek-Roman colony that stood in the surroundings.

In the 1950s the Azienda Nazionale Idrogenazione Combustibili dammed the river near Licodia Eubea to create Lago Dirillo, a reservoir for the Polo petrolchimico di Gela petrochemical plants. With good fishing and camping facilities, as well its natural scenic beauty, this area has become a tourist attraction.