Red Lake (Croatia)
|Native name||Crveno Jezero (Croatian)|
|Surface area||2.7 hectares (6.7 acres)|
|Average depth||245 m (804 ft)|
|Max. depth||287 metres (942 ft)|
|Surface elevation||522 m (1,713 ft)|
Red Lake (Croatian: Crveno jezero) is a sinkhole containing a karst lake near the city of Imotski, Croatia. It is known for its numerous caves and remarkably high cliffs, reaching over 241 metres above normal water level and continuing below the water level. The total explored depth of this sinkhole is approximately 530 metres with a volume of roughly 25–30 million cubic meters, thus it is the third largest sinkhole in the world. Water drains out of the basin through underground waterways that descend below the level of the lake floor. The deepest known point of the lake is 4 meters below sea level.
The sinkhole is named after the reddish-brown color of the surrounding cliffs, colored by iron oxides.
The lake is inhabited with endemic and endangered spotted minnow (Delminichthys adspersus). In the dry period of the year, this fish can be occasionally seen in surrounding springs, rivers and lakes, suggesting that there is an underground connection between Red Lake and other water bodies.
At the 13th International Congress of Speleology in 2001, new findings were revealed. An inflow cave-shaped canal that measured approximately 30 × 30 meters was discovered in the eastern part of the lake at a depth of 175 meters.
- Ozimec, Jalžić & Jelić 2017, p. 36.
- "Crveno Jezero - Red Lake". Wondermondo.
- "Natural beauties". Split and Dalmatia county Tourist Board.
- Ozimec, Jalžić & Jelić 2017, p. 38.
- Garasic, Mladen (2001). "New Speleohydrogeological Research of Crveno jezero (Red Lake) near Imotski in Dinaric Karst Area (Croatia, Europe) - International speleodiving expedition "Crveno jezero 98"" (PDF). Croatian Speleological Association.
- Ozimec, Roman; Jalžić, Branko; Jelić, Dušan (December 2017). "Preliminarni izvještaj prirodoslovnih istraživanja u okviru Speleoronilačke ekspedicije Crveno jezero 2017" [The Preliminary Report on Natural Sciences Research During the Cave Diving Expedition to the Red Lake 2017] (PDF). Subterranea Croatica (in Croatian). 15 (2): 34–41. Retrieved 14 September 2018.