Taudaha Lake

Taudaha is a small natural freshwater lake on the southern rim of the Kathmandu Valley, lying near the Chobhar gorge in the Kirtipur area of Kathmandu District, Bagmati Province. It sits at roughly 1,300 m above sea level, a short distance (about 8 km) south-west of central Kathmandu, and is one of the few surviving open-water bodies inside the heavily urbanised valley.

The lake is widely described as a remnant of the much larger prehistoric lake that geologists believe once filled the entire Kathmandu Valley. In that account the valley floor is a former lakebed, and Taudaha is a residual pool left behind after the ancient lake drained out through the Chobhar gorge, where the Bagmati River now leaves the valley. The lake is shallow and small in extent.

Reported dimensions place the water body at roughly 500 metres long and 400 metres wide, giving a surface area on the order of a few hectares. Sources differ on the exact figure: several travel and reference descriptions give an area of about 4 hectares, while some publications (including the Wikipedia article) cite a much larger 463 hectares — a number that is hard to reconcile with the lake's documented dimensions and that may instead reflect a catchment figure or an error. Reported elevation also varies modestly across sources (roughly 1,290-1,350 m). Where figures conflict, the smaller, dimension-consistent size is the more credible description of the open water itself.

Despite its modest size, Taudaha is one of the most important bird sites remaining in the Kathmandu Valley. It functions as a wetland stopover and wintering ground for waterbirds moving along the Central Asian Flyway, with migrants arriving from regions such as Tibet, Mongolia, Siberia, China and Central Asia. In winter the lake and its margins can host substantial numbers of ducks and other waterfowl.

Documented winter visitors include the great cormorant, ruddy shelduck, northern shoveler, mallard, gadwall, Eurasian (common) coot, northern pintail and common teal, among others, while resident and seasonal land birds recorded around the lake include black kite, black drongo, cattle egret, common myna, red-vented bulbul, rose-ringed parakeet and white-throated kingfisher. Nationally threatened species such as the common pochard, ferruginous duck and black-headed gull have also been noted at the site. The lake additionally supports fish (including introduced carp species) and other wetland fauna.

Long-term monitoring, including annual January censuses associated with Bird Conservation Nepal, has documented a decline in the number of bird species and individuals using the lake. Census-based species counts fell from the high twenties in the mid-2010s to the high teens by the early 2020s, and some species formerly recorded at Taudaha have not been seen in recent years. Reported drivers of this decline include surrounding urbanisation, habitat alteration of the shoreline, noise and artificial light, and other human disturbance.

Taudaha is wrapped in some of the best-known origin legends of the Kathmandu Valley. In the widely told myth, the bodhisattva Manjushree drained the primeval valley lake by cutting open the hills to the south, an act traditionally identified with the Chobhar gorge, so that the exposed land could be settled. Taudaha is remembered in this tradition as a surviving piece of that original lake.

A second, closely linked legend concerns the serpent deities (nagas). When the great lake was drained, the nagas who lived in it were said to be left without a home, angering the serpent king Karkotak (Karkotaka), one of the great naga kings of Hindu and Buddhist tradition. According to the story, the people created or left an underwater abode for the nagas, and Karkotak agreed to dwell there and to protect the area on the condition that the peace of his watery home never be disturbed.

This belief underpins the lake's sacred character and its enduring local taboos: by long-standing tradition, people do not fish in or swim in Taudaha, out of respect for the nagas said to inhabit it. The very name reflects this association, being derived from Newar words meaning 'snake' and 'lake'. These myths make Taudaha a culturally significant pilgrimage and storytelling site as well as a natural one.

Taudaha is an easily reached day-trip destination from Kathmandu, lying on the road toward Pharping and the southern valley rim, and is popular for quiet walks, birdwatching (especially in winter) and as a scenic stop. Because fishing and swimming are traditionally forbidden, visitor activity centres on walking the shoreline and observing wildlife rather than water sports.

As one of the last sizeable natural wetlands in an intensely developed valley, Taudaha is frequently highlighted in conservation discussion. Pressures reported around the lake include encroachment and construction along its banks, conversion of natural shoreline and resting areas to concrete, growth of restaurants and other commercial activity, and noise and light pollution, all of which have been linked to the decline in its bird life.

Conservationists and local bodies have called for protecting Taudaha as both an ecological refuge and a heritage site, balancing its role as a public recreation spot with the need to limit disturbance for migratory and resident birds. Its combination of biodiversity value, status as a relic of the valley's geological past, and deep mythological significance makes it a site where natural and cultural conservation interests strongly overlap.