[citation needed] About 9,000 years ago, a second eruption formed another volcanic cone inside the lake with a maar.

The volcanic cone island resisted erosion by the harsh weather conditions due to its massive material, and has retained its form for thousands of years.

[2] On June 21, 2005, the lake and its surrounding area was declared a Ramsar site because of its international importance for wildfowl.

[5] In 2012, it was reported that the lake's capacity had decreased by about 60% within the last twenty years and that there was a risk that it would dry out completely.

[6] A drought season in 2014 caused a lowering of the groundwater level which was responsible for the further drying out of the lake to an extent of almost 99%.