The Dirillo, or Acate, is a 54 km river in Sicily which springs from the Iblei mountains and flows through the areas of Vizzini, Licodia Eubea, Mazzarrone, Chiaramonte Gulfi, Acate, Vittoria, Gela. It enters the Strait of Sicily south-east of the town of Gela. As the largest river in the area it's sometimes known as the Fiume Grande. The river was known in antiquity as the Achates. Theophrastus in his treatise On Stones (ca. 315 B.C.) indicates that the name of the gemstone achates (agate) was… (More on Dirillo)