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Gokyo Lakes
Gokyo Lakes are oligotrophic lakes in Nepal's Sagarmatha National Park, located at an altitude of above sea level. These lakes are the world’s highest freshwater lake system comprising six main lakes, of which Thonak Lake is the largest.〔Bhuju, U.R., Shakya, P.R., Basnet, T.B., Shrestha, S. (2007). (''Nepal Biodiversity Resource Book. Protected Areas, Ramsar Sites, and World Heritage Sites'' ). International Centre for Integrated Mountain Development, Ministry of Environment, Science and Technology, in cooperation with United Nations Environment Programme, Regional Office for Asia and the Pacific. Kathmandu, Nepal. ISBN 978-92-9115-033-5 〕 In September 2007, Gokyo and associated wetlands of have been designated a Ramsar site.〔Bhandari, B. B. (2009). (''Wise use of Wetlands in Nepal'' ). Banko Janakari, Special Issue February 2009: 10–17.〕
==Lake system==
Gokyo lakes are located in Khumjung Village Development Committee of Solukhumbu District in Sagarmatha Zone in north-eastern Nepal. Gokyo Cho, also called Dudh Pokhari, is the main lake with an area of , and the village of Gokyo lies on its eastern shore. Thonak Cho is the largest lake with an area of . Gyazumpa Cho is in size, followed by Tanjung Cho with an area of , and Ngojumba Cho with an area of . As sources of permanent fresh water they have high hydrological value. They feed on waters from various sources, such as seepage from the Ngozumpa glacier, a stream coming from the Renjo La pass from north-west and another stream originating from the Ngozumpa glacier in the east. These are glacier-fed freshwater wetlands and discharge water to the Dudh Kosi headway via the Taujon Lake and the Longabanga Lake. These lakes are deeper than previously assumed by the researchers. Fourth Lake (Thonak Cho) is the deepest lake (62.4m) followed by the Gokyo Lake which is 43 m.〔Sharma, C. M., Sharma, S., Gurung, S., Bajracharya, R. M., Jüttner, I., Kang, S., Zhang, Q., Li, Q. (2012). ''First results on bathymetry and limnology of the Gokyo wetlands, high altitude tropical lakes, Nepal''. Limnology 13:181–192.〕 A direct connection between the Gokyo Lake and the upper Thonak Cho and the Ngozumpa Cho has not been observed, but these lakes may be connected via underground seepage water. The Gokyo lake system is naturally vulnerable, as it is lying in an ecologically fragile and unstable zone. The outburst of Ngozumpa glacier is always a threat to the existence of the lakes.
The Gokyo lake system of 19 lakes is spread over an area of lying between . The wetland lies on the head of the Dudh Kosi, which descends from Cho Oyu.
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