Tarn (lake)

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Glacial action forming a tarn
Robert Tarn, Mackenzie Tarn and Johnston Tarn (foreground to background), Tarn Shelf, Mt Field National Park, Tasmania, Australia. The tarns were formed by glacial scouring.[1]

A tarn (or corrie loch) is a mountain lake or pool, formed in a cirque excavated by a glacier. A moraine may form a natural dam below a tarn.[2] A corrie may be called a cirque.

The word is derived from the Old Norse word tjörn meaning pond. Its more specific use as a mountain lake emerges as it is the commonly used term for all ponds in the mountainous areas of Northern England, particularly Cumbria. Here, it retains a broader use, referring to any small lake or pond, regardless of its location and origin. [3]

In Scandinavian languages a tjern or tjärn, tärn or tjørn is a small natural lake, often in a forest or with vegetation close around it or growing into the lake.

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  1. ^ "Mt Field National Park: Landforms, Flora and Fauna". Parks and Wildlife Service Tasmania. http://www.parks.tas.gov.au/file.aspx?id=6757. Retrieved 2009-05-12. 
  2. ^ "Illustrated Glossary of Alpine Glacial Landforms". http://www.uwsp.edu/geo/faculty/lemke/alpine_glacial_glossary/glossary.html. Retrieved 2007-08-05. 
  3. ^ "Fresh Water Tarns". Cumbria Wildlife Trust. http://www.wildlifetrust.org.uk/cumbria/Surveys/What%20is%20a%20Tarn.htm. Retrieved 2007-08-05.