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The Gacka is a river located in the Lika region of central Croatia.
Because for a large part of its course it is a subterranean river, estimates of its length vary. The aboveground part has undergone substantial human intervention – before it was 32km (20miles) long; now it is only 11km (07miles) long.[1] It has been regulated by man to flow into an aqueduct in Gusić polje (known as Tunel Gacka-Gusić Jezero[2]) and then into the Adriatic Sea through the hydroelectric installation HE Senj near Sveti Juraj.[1] Built in 1965, HE Senj takes inflow from both the Gacka and Lika rivers.[3] [4]
The river passes through karst fields and most notably the town of Otočac, and its headwaters are known as a popular locale for trout fishing.[5] [6]