Catchment area of the Abens (tributary of the Danube river) emphasized, and the terrain elevation (spatial resolution 50 m and elevation steps of 20 m). Due to karstification almost no surface runoff exists within the hatched areas.
<a href="//commons.wikimedia.org/wiki/User:Periphrastika" title="User:Periphrastika">Periphrastika</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>