Shey Phoksundo Lake

Shey Phoksundo Lake (also written Phoksundo Lake) lies in the remote Dolpa District of north-western Nepal, within the Dolpo region of Karnali Province, at an elevation of roughly 3,611 metres (about 11,849 ft). It is the centrepiece of Shey Phoksundo National Park, the largest national park in Nepal, and is celebrated for its intense turquoise to deep-blue colouring, a result of the lake's clarity, depth and the absence of significant suspended sediment.

Phoksundo is widely described as the deepest lake in Nepal, though this distinction is contested: a 2004 survey by Nepal's Department of Hydrology and Meteorology recorded a maximum depth of 145 m (476 ft) and a more detailed 2019 survey measured 136.2 m (446.9 ft), both less than the roughly 167 m maximum depth reported for Rara Lake. It has a water surface of approximately 494 hectares (about 4.94 km2) and a water volume on the order of 409 million cubic metres. Sources describe the lake as elongated, several kilometres long and roughly half a kilometre to one kilometre wide.

Geologically, Phoksundo is understood to have formed behind a natural landslide dam estimated to be some 30,000 to 40,000 years old. The Tibetan village of Ringmo sits atop this dam at the lake's southern end. Just beyond it, the lake's outflow drains into the Suligad (Phoksundo) River and cascades over one of Nepal's highest waterfalls, reported at around 167 m (548 ft). The lake is classified as an alpine freshwater oligotrophic lake, meaning it is cold, clear and low in nutrients.

As a high-altitude, nutrient-poor (oligotrophic) lake, Phoksundo's waters support very limited aquatic life; the lake is often described as appearing strikingly clear, a feature that has fed local legend as well as scientific interest. It was designated a Wetland of International Importance under the Ramsar Convention on 23 September 2007 (Ramsar Site No. 1694), recognised as an ecologically significant high-altitude Himalayan wetland.

The surrounding Shey Phoksundo National Park, established in 1984, covers about 3,555 km2 (1,373 sq mi) across the Dolpa and Mugu districts and spans an enormous altitudinal range, from roughly 2,130 m to 6,885 m at the summit of Kanjiroba Himal. This range shelters a rich trans-Himalayan fauna, including the endangered snow leopard, and the park is regarded as an important stronghold for the species.

Other notable mammals of the park include grey wolf, Himalayan musk deer, blue sheep (bharal), goral, Himalayan tahr, common leopard and Himalayan black bear. The bird life is diverse and adapted to high elevations, with species such as the Tibetan partridge, wood snipe and rosefinches recorded; many undertake altitudinal migrations in response to seasonal snow and food availability. The park also supports a smaller community of amphibians and reptiles adapted to the harsh, freezing Himalayan winters.

Phoksundo Lake is sacred to both Tibetan Buddhists and followers of Bon (Bon-Po), an indigenous Tibetan religious tradition that remains especially strong in upper Dolpo. The shoreline and surrounding hills hold Tibetan Buddhist stupas (chortens) and gompas (monasteries), and Shey Phoksundo National Park as a whole contains important religious sites, including Shey Gompa. Local communities carry out regular prayers and seasonal worship at these sites.

A well-known local legend links the lake's origin to a demoness who, in flight, caused the waters that became Phoksundo Lake to submerge a settlement; such stories are commonly associated in Dolpo's oral tradition with Padmasambhava (Guru Rinpoche), the 8th-century Buddhist master credited with spreading Buddhism across the Himalaya. These tales illustrate the deep interweaving of Bon and Buddhist belief in the region.

The principal human settlement at the lake is Ringmo, a traditional Tibetan village built on the ancient landslide dam. Its inhabitants are predominantly of Tibetan heritage and practise Bon and Buddhist traditions, sustaining themselves historically through yak herding, trans-Himalayan trade and, increasingly, tourism. The village and its monasteries are among the cultural highlights of the Dolpo region.

Phoksundo Lake is one of the most celebrated trekking destinations in western Nepal, typically reached via the district headquarters of Dunai and the trail up the Suligad valley from Juphal, the regional airstrip. The classic route to the lake passes the towering Phoksundo waterfall before arriving at Ringmo village and the lake shore. Because of Dolpo's remoteness and restricted-area regulations in parts of upper Dolpo, visitors require national park entry permits and, for certain zones, special trekking permits.

Conservation of the lake is taken seriously given its Ramsar status and fragile high-altitude ecosystem. To protect water quality and the lake's spiritual and ecological integrity, activities such as swimming, bathing and boating are restricted. The pristine, low-nutrient character of the water is central both to its ecological value and to its famous turquoise appearance, and authorities and local communities work to limit pollution and disturbance.

Scientific monitoring of the lake continues, with recent hydrochemistry and water-quality studies examining the lake as a representative higher-Himalayan Ramsar site. Managed by Shey Phoksundo National Park within Nepal's protected-area system, the lake remains a focus for biodiversity conservation, cultural preservation and sustainable, low-impact tourism in one of the country's least accessible regions.