Nepal is in the middle of one of its worst natural disasters in recent memory. A flash flood that tore down the Bhote Koshi River from the Tibetan border on Wednesday, August 26, 2026, has killed at least 389 people and left 977 more missing, according to the sixth situation report from Nepal’s National Disaster Risk Reduction and Management Authority, issued Thursday night. Search teams expect the toll to keep rising.
How the Disaster Unfolded
The flood began around 9 a.m. local time on Wednesday, when a violent surge of water, ice, rock, and sediment crossed into Nepal’s Rasuwa district from the Tibetan side of the border. It tore through Rasuwa before feeding into the Trishuli and Narayani river systems, smashing into villages, security posts, hydropower plants, highways, and bridges as it pushed roughly 168 kilometres south to Devghat.
Nepal’s Flood Forecasting Division estimates that around 20 million cubic metres of extra water entered the river system, with peak discharge reaching about 5,850 cubic metres per second. A magnitude 4.4 tremor was recorded in Tibetan territory just before the flood hit; later analysis suggests instruments may have picked up the collapse of a glacier rather than a typical earthquake. Preliminary geological assessments point to an ice avalanche as the trigger, though scientists say the exact sequence of events is still being investigated — and note that warming temperatures in the Himalayas have made this kind of high-altitude disaster more likely.
Automated river-monitoring stations at Syabrubesi, Betrawati, and Malekhu went dark as the flood swept past them. Authorities managed to send more than 679,000 emergency text alerts to people downstream, which officials believe prevented an even higher death toll.
The Toll, District by District
As identification work continues, Nepal Police figures show Chitwan hit hardest with 137 deaths, followed by Nawalparasi East (87), Dhading (33), Gorkha (32), Nuwakot and Tanahun (28 each), Nawalparasi West (27), and Rasuwa (17). These numbers are described as provisional and likely to shift as agencies reconcile overlapping lists.
The missing include trekkers, pilgrims, migrant workers returning home, hydropower staff, customs and immigration officers, and security personnel who were stationed along the border. Among them are 517 foreign nationals — Indian citizens make up the largest group, followed by travellers from the United States, Malaysia, Ukraine, Britain, Australia, and Canada — turning the disaster into a search effort spanning more than 30 countries. Another 127 Nepali citizens returning from abroad are also unaccounted for.
The flood struck during the Kailash Mansarovar pilgrimage season, which put an unusually high number of foreign travellers along the affected route. India’s foreign ministry has confirmed 84 of its nationals rescued so far, including hydropower workers and pilgrims from Tamil Nadu, and is still tracing others.
Across the border in Tibet’s Gyirong County, Chinese authorities have reported 3 deaths and 558 people missing, including 260 foreign nationals. Gyirong is a key trade and travel crossing between China and Nepal, and it suffered heavy damage.
A Second Threat: A Growing Barrier Lake
Even as recovery work continues, a new danger has emerged upstream. Debris from the original flood has dammed the river and formed a barrier lake that satellite imagery shows is still expanding — estimated at around 2 million cubic metres of water, with as much as 3 million more potentially flowing in over coming days. Nepali and Chinese authorities are modelling what would happen if it breaches, since a sudden release could send another surge through the same already-battered corridor. Residents and rescue crews have been told to stay away from the riverbanks along the Bhote Koshi and Trishuli.
Nepal’s Response
Roughly 13,295 police, army, and Armed Police Force personnel have been mobilised, backed by 15 helicopters. Officials say nearly 1,976 people have been airlifted to safety so far, while crews work to reopen roads to communities that remain cut off.
The damage to infrastructure is extensive: dozens of bridges destroyed, around 40 kilometres of road damaged, and 12 hydropower plants with a combined capacity of 431 megawatts knocked off the national grid.
Prime Minister Balendra Shah said the government’s machinery was operating at full capacity, with saving lives, locating the missing, and delivering relief as the immediate priorities. President Ram Chandra Paudel called for a unified national relief effort. Nepal has released NPR 25 million in emergency funds for Rasuwa, Nuwakot, and Dhading, and set up 12 coordination teams covering health, communications, power restoration, and international assistance.
International Support
Aid has started arriving from abroad. The United States pledged $500,000 in humanitarian support and sent a disaster-response adviser. The World Health Organization has dispatched medical supplies and tents. India has sent nearly 50 tonnes of relief material, South Korea pledged $1 million and a response team, and Britain committed £5 million along with emergency personnel. The Red Cross and Médecins Sans Frontières have also deployed support on the ground.
For now, the work remains grim and immediate: helicopters searching isolated valleys, teams combing riverbanks where roads used to be, and families waiting for word on hundreds still unaccounted for — while the lake upstream keeps rising.