Swallow holes of Rašica brook are situated nearby Ponikve village on the east side of a 700 m long and 160 m wide polje. Rašica brook flows from the area of Veliki log and disappears through these swallow holes into the subterranean world, heading towards the south side of Radenjsko polje, where the water re-emerges on the surface as the Šica brook.
These karst features are essential for the drainage of the Dobrepolje area. During heavy rains, the capacity of the swallow holes is often exceeded, leading to seasonal flooding of the surrounding meadows. This dynamic interaction between surface water and the karst underground is a classic example of the hydrological complexity found in Slovenia's central karst region.