Petnja artificial lake is located on the south side Dilj-up, 3.5 km northeast of Sibinj and 7 km northwest of Slavonski Brod. Lake impresses with its appearance, forested surroundings, walking paths, opportunities for fishing, boating and other water sports, and clean air. The special charm of the lake provides water to blend the blue and green patchwork woods, which earned him the epithet diljsko around. North of this protected site, a source close to the stream Petnja (Vid hill), there are several small caves, among which the most interesting form of erosive canyon Pljuskara seems that, with the cave, and includes three waterfalls on the creek.