[3] The lake can be reached via a track, and there are two areas with high temperature that can be found not far from it: Seltún/Krýsuvík and another to the east.

A 2012 survey demonstrated one definite geothermal vent under the lake and suggested two others in a linear line trending as for most of the faults in the area.

[2][1] After the 2000 Iceland earthquakes, the lake began to diminish, so that at least 20% of its surface has since disappeared and the serial surveys suggest there has been some material deposition as depth has reduced more than height above sea level of the lake surface.

[2][1] The pattern of sedimentation suggests that at some time in the past the lake was smaller in size than it was in 2012.

[2] The novel Kleifarvatn by Icelandic writer Arnaldur Indriðason was named after the lake.