Lake Kleifarvatn is located in a geothermal area on the Reykjanes peninsula, near Krýsuvík hot spring area, about 40 minutes drive from Reykjavik. Being situated right on the mid-Atlantic ridge the volcanic landscape does not only make up the lakes surroundings but also adds exceptional features to this diving spot. The site is very remote and gives you a feeling of being in the middle of nowhere.
Lake Kleifarvatn has underwater hot springs that pump warm water and gases into the lake, making it a totally outstanding diving site. Here you can see and experience how a thousand bubbles of sulphur dioxide and hydrogen sulphide are ascending from underground, into the water around you.
The lake has no visible water coming in or going out of it as all this happens under surface. A large earthquake in 2001 caused the subsurface to change resulting in the lake diminishing greatly with up to 20% if it disappearing at some point. The cracks caused by the earthquake have since then gradually filled up and in 2008 the lake had reached its original size again.
The bottom of lake Kleifarvatn consists is very sensitive, so its important to be on top of your bouyancy control when diving here. Kleifarvatn is also one of the deepest lakes in Iceland, reaching a depth of around 90 meters. The visibility ranges between 5 – 15 meters depending on the season and the weather. The temperature goes from +1 degree C in the winter to +14 degrees in the summer.
Kleifarvatn has been connected with mystique over the years and was the main setting for one of Iceland’s most widely read crime novel that also takes its name from the lake. It is said to be a monster living in the lake. Witnesses says that the monster is the size of a whale but has the shape of a worm. Don´t forget to bring your camera just in case!