Category
page 1Sinking rivers
subterranean river
river that runs wholly or partly beneath the ground surface
Reka River
river in Slovenia
Pivka
river in Slovenia

Temenica
The Temenica is a river in Slovenia. It is one of the most typical influent streams of Slovenia's karst terrain.
Rak
river in Slovenia
Bjurälven
Bjurälven is a river in Jämtland, Sweden. The river is partially underground and has a famous cave area.