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| Kleifarvatn | |
|---|---|
 Lake Kleifarvatn in Iceland | |
  Kleifarvatn | |
| Location | Reykjanes |
| Coordinates | 63°55′30″N 21°58′48″W / 63.92500°N 21.98000°W |
| Basin countries | Iceland |
| Max. length | 4.7 km (2.9 mi) |
| Max. width | 2.5 km (1.6 mi) |
| Surface area | 8 km2 (3.1 sq mi) |
| Max. depth | 97 m (318 ft) (as of 2000[update]) |
Kleifarvatn (Icelandic pronunciation: [ˈkʰleiːvarˌvahtn̥] ⓘ) is the largest lake on the Reykjanes Peninsula in Iceland, situated in the southern part of the peninsula. It is located on the fissure zone of the Mid-Atlantic Ridge. The lake has no visible water coming in or going out as most of its water comes and leaves underground.[1] 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. The lake's greatest depth is 97 m. After the 2000 Iceland earthquakes, the lake began to diminish, and 20% of its surface has since disappeared.
The novel Kleifarvatn by Icelandic writer Arnaldur Indriðason was named after the lake.
