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:''This page describes the geological feature. For the lake of the same name in Oregon, see Crater Lake.''
A 'crater lake' is a lake that forms in a volcanic crater, caldera, or maar. Incoming precipitation fills the depression to form a deepening lake, until an equilibrium is reached between the rate of water coming in and the rate of water loss due to evaporation, subsurface drainage, and possibly also surface outflow if the lake fills the crater up to the lowest point on its rim. Crater lakes covering active (fumarolic) volcanic vents are often known as 'volcanic lakes', and the water within them is typically acidic, saturated with volcanic gases, and cloudy with a strong greenish color. Lakes located in dormant or extinct volcanoes tend to have fresh water, and the water clarity in such lakes is often exceptional due to the lack of inflowing streams and sediment.
A well-known crater lake, which bears the same name as the geological feature, is Crater Lake in Oregon, USA. It is located in the caldera of Mount Mazama, hence the name
"Crater Lake" is somewhat of a misnomer. It is the deepest lake in the United States with a depth of . Crater Lake is fed solely by falling rain and snow, with no inflow or outflow at the surface, and hence has the clearest water of any lake in the world.
The highest volcano in the world, Ojos del Salado, has a permanent crater lake about in diameter at an elevation of on its eastern side.^[1] This is most likely the highest lake of any kind in the world.
Due to their unstable environment, some crater lakes exist only intermittently. Caldera lakes in contrast can be quite large and long-lasting; for instance, Lake Toba formed after its eruption around 70,000 years ago and has an area of over 1,000 square kilometres.
While many crater lakes are picturesque, they can also be deadly. Gas discharges from Lake Nyos suffocated 1,800 people in 1986, and crater lakes such as Mount Ruapehu's often contribute to destructive lahars.
Lakes can also fill impact craters, but these are not usually referred to as crater lakes except in a few isolated cases. Example of such impact crater lakes include Lake Bosumtwi in Ghana and Siljan in Sweden.

Contents

Notable crater lakes

See also

References

External links

Notable crater lakes

Lake	Location
Lake of Albano
Blue Lake	, South Australia
Lake Bolsena
Lake Bracciano
Crater Lake	, Oregon
Cuicocha
Heaven Lake (Chonji / Tianchi)	/
Volcán Irazú
Kapoho Crater	, Hawaii
Mount Katmai	, Alaska
Rano Kau	, Rapa Nui (Easter Island)
Kelut
Kerið
Kurile Lake	(Kamchatka)
Medicine Lake Volcano	, California
Mashu
Lake Nemi
Nemrut
Newberry Volcano	, Oregon
Lake Nyos
Mount Pinatubo
Rano Raraku	, Rapa Nui (Easter Island)
Mount Ruapehu
Soufrière	St. Vincent
Taal Lake
Lake Taupo
Tazawa
Lake Toba
Towada
Lake Vico
Lake Wenchi [2]

See also

★ Lake breakout

References

★

★ Crater Lakes, , Johan C., Varekamp, Journal of Volcanology and Geothermal Research, (entire volume about crater lakes)

★ Volcanic lake systematics I. Physical constraints, , G. B., Pasternack, Bulletin of Volcanology,

★ Geochemistry of Crater Lakes, , Minoru (ed.), Kusakabe, Geochemical Journal, (entire issue about chemistry of crater lakes)

★ IAVCEI Commission of Volcanic Lakes

★ IAVCEI Commission of Volcanic Lakes: Some fundamentals about Crater Lakes

★ The Science of Volcanic Lakes

★ Volcanic Lakes of the World
1. http://www.andes.org.uk/peak-info-6000/ojos-info.htm
2. http://www.gtz.de/de/praxis/11695.htm Description of Mount Wenchi crater lake on the website of GTZ

External links

★ USGS Hawaiian Volcano Observatory: Water on volcanoes: heavy rain and crater lakes

★ USGS Cascades Volcano Observatory: Volcanic Lakes

★ The Science of Volcanic Lakes, Greg Pasternack, U. California Davis