sentences:  A balloon station "Pena" was situated on location, as prior to the discovery of radio, balloons were used for signalization during the navigation through the canal.Prior to the construction of the Iron Gate I Hydroelectric Power Station, which dammed the Danube and created the Lake Đerdap in 1967–72, belugas from the Black Sea reached the gorge, travelling upstream for .Specimen, up to , used to be fished in Donji Milanovac.