Hoellental Gorge, Lower Austria, narrow valley of the River Schwarza between the villages of Singerin (alt. 577 m) and Hirschwang an der Rax (alt. 500 m) in the Lower Austrian limestone Alpine area. To the north the Hoellental is delimited by the Schneeberg massif (Klosterwappen, 2,076 m), to the south by the Rax massif (Heukuppe, 2,007 m); it is almost uninhabited. Parallel to the River Schwarza runs the first Vienna Hochquellenleitung water supply lines (Museum of Water Supply).
In the south the steep-faced Grosses Hoellental valley emerges from the Rax massif and runs into the Hoellental.