Phoksundo Lake is an alpine fresh water oligotrophic lake in Nepal's Shey Phoksundo National Park at an elevation of in the Dolpa District. Phoksundo Lake is in size with a water volume of and a discharge of . In 2004, a survey by the Department of Hydrology and Meteorology measured the maximum depth of the lake at .Nepalnews.com (2004). Rara is Nepal’s deepest lake: Survey In 2019, another detailed survey was carried out by the Department of Hydrology and Meteorology, which measured the maximum depth of the lake at .
In September 2007, Phoksundo Lake has been designated a Ramsar site.Bhandari, B. B. (2009). Wise use of Wetlands in Nepal. Banko Janakari, Special Issue February 2009: 10–17.
On the lake' southern end, the village of Ringmo sits on the 30,000- to 40,000-year-old landslide dam that formed the lake.Weidinger, J. T. (2005). Predesign, failure and displacement mechanisms of large rockslides in the Langthang-, Annapurna- and Kanjiroba Himalayas of Nepal. Geophysical Research Abstracts, Vol. 7, 04125, 2005 Past the dam, the waters of the lake plunge over a tall waterfall.
Religious significance There are more than 20 Tibetan stupas in the northern belt, and one gompa in the eastern side of the lake, where annual prayers and worship are carried out. Traditional Tibetan culture prevails in upper Dolpo; Buddhism and Masto are prevalent in lower Dolpo, including Ringmo village.
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