Red Tarn
{{Short description|A mountain lake in Cumbria, England}}
{{Use dmy dates|date=April 2022}}
{{Infobox body of water
| name = Red Tarn
| image = Red Tarn, Lake District - June 2009.jpg
| caption = from the Helvellyn summit
| alt = A small lake sandwich between two mountain ridges
| image_bathymetry =
| caption_bathymetry =
| location = Lake District, Cumbria
| coords = {{Coord|54|31|42|N|3|00|31|W|region:GB_type:waterbody|display=inline,title}}
| type =
| inflow =
| pushpin_map = United Kingdom Lake District#United Kingdom Eden
| pushpin_map_caption = Location in the Lake District National Park##Location in Eden, Cumbria
| pushpin_label_position =
| outflow =
| catchment =
| basin_countries = United Kingdom
| length =
| width =
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| depth =
| max-depth = 25m (82 ft)
| volume =
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| shore =
| elevation = 718m (2,356 ft)
| islands =
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}}
Red Tarn is a small lake in the eastern region{{cite web|url=http://www.leaney.org/item.php?id=461|title=Red Tarn (Helvellyn) - theLakelandFells|publisher=|accessdate=30 March 2017}} of the English Lake District, in the county of Cumbria. It is high up on the eastern flank of Helvellyn, beneath Striding Edge and Catstye Cam. Red Tarn was formed when the glacier that carved out the eastern side of Helvellyn had melted. The lake along with three others in Lake District is a habitat for the very rare and endangered Schelly fish. Red Tarn was a dam in the nineteenth century that used boulders that raised the water level some eight or nine feet in order to supply power to the Greenside Mine at Glenridding. Today the tarn is a popular rest stop for hikers and nature goers.
File:Cisco.jpg fish{{Cite journal | doi = 10.1080/00222939000770641| title = Status of the schelly, Coregonus lavaretus (L.), in Red Tarn, Cumbria, England| journal = Journal of Natural History| volume = 24| issue = 4| pages = 1067| year = 1990| last1 = Maitland | first1 = P. S. | last2 = Lyle | first2 = A. A. | last3 = Barnett | first3 = I. K. O. }} ]]
File:Glacial Tarn Formation EN.svg
It lies at an altitude of 718 metres (2,356 feet), with a depth of 25 metres (82 feet).
The tarn is one of two of the same name in the Lake District. A second, much smaller Red Tarn lies between Pike of Blisco and Cold Pike, west of the Langdales.