The biggest lake in the area, Kleifarvatn, began to diminish after a big earthquake in 2000; 20% of its surface has since disappeared.
There are numerous hot springs and sulphur springs in the southern half of the peninsula, around the Kleifarvatn lake and the Krýsuvík geothermal area.
The title is based on a real Icelandic lake Kleifarvatn, which began draining away in 2000 following an earthquake.