A glacier collapse sent rock, ice and mud through Himalayan valleys, while new barrier lakes raised fears of another destructive surge.
KATHMANDU, Nepal — The death toll from catastrophic flooding along the Nepal-China border has climbed to at least 472, while more than 1,500 people remain missing as rescue crews search Himalayan valleys devastated by a massive glacier collapse.
Nepal’s disaster management authority said Friday morning that 469 people had been confirmed dead and 977 remained missing on the Nepali side of the border. Chinese authorities had reported three deaths and 558 people missing in Tibet’s Gyirong County, bringing the combined missing count above 1,500. Officials cautioned that the figures were changing as rescue teams reached isolated communities and agencies compared lists of residents, tourists, workers and pilgrims who had been reported missing.
The disaster began Wednesday morning when part of a glacier and surrounding rock collapsed high in the Himalayas near the Nepal-China border. The U.S. Geological Survey said seismic analysis pointed to a source on a glaciated mountain cliff on the north side of Langtang Lirung. The collapse generated seismic energy that was initially reported as an earthquake, but scientists later determined the signal came from the enormous movement of rock and ice and the debris flow that followed. The resulting flood traveled through the Bhote Koshi and Trishuli river systems and affected communities nearly 100 kilometers downstream.
Rescue teams in Nepal have used helicopters, heavy machinery and ground crews to search settlements and riverbanks covered by mud and debris. Thousands of people have been rescued, including residents and foreign visitors who were trapped after roads and bridges were destroyed. Nepalese authorities have deployed soldiers, police and Armed Police Force personnel throughout the affected region. The damage has made some communities difficult to reach by road, forcing helicopters to carry survivors and deliver food, tents, medicine and other emergency supplies.
The flood struck a mountain corridor heavily used by tourists, trekkers and religious pilgrims traveling between Nepal and Tibet. Hundreds of foreigners remain unaccounted for. Authorities have reported missing travelers from more than 30 countries. India said 288 of its nationals were uncontactable, while the U.S. State Department said about 90 Americans were unaccounted for in Nepal and China. Officials also reported missing citizens from Malaysia, Ukraine, Australia, Britain, Canada, South Korea and several European countries. Many travelers were heading toward or returning from Mount Kailash, a major pilgrimage destination in Tibet.
Across the border in Tibet, the flood and mudslide caused severe destruction around Gyirong Port, a major land crossing between China and Nepal. Chinese authorities said 558 people were missing in Gyirong County, including about 260 foreign nationals. Roads, power service and communications were disrupted, slowing efforts to reach some areas. China sent national search-and-rescue personnel, medical workers, engineers and emergency communications teams to the region while crews worked to restore access to the border port.
The surge also damaged homes, markets, bridges, roads, power stations and other infrastructure across northern and central Nepal. Floodwater and debris traveled far downstream, leading search crews to expand recovery operations along the river system. Authorities in districts well south of the initial disaster area reported recovering victims carried downstream by the current. Officials said the broad search area and damaged communication networks have made it difficult to determine how many people remain missing and where they may have been when the flood struck.
Scientists and emergency officials are also watching newly formed lakes created when debris blocked mountain waterways. Nepal’s disaster management authority warned that water was building behind a blockage on the Bhote Koshi River, creating a risk that the natural dam could fail. Chinese authorities were monitoring another barrier lake near the border and sent engineers to conduct aerial surveys and study possible ways to release water safely. Officials warned that another sudden release could threaten communities already damaged by Wednesday’s flood.
The glacier collapse has also drawn renewed attention to the instability of the high Himalayan landscape. The U.S. Geological Survey said its scientists were using satellite imagery to map the flood and debris-flow boundary and assess the collapse site. Researchers have said warming temperatures can contribute to instability in glaciers and mountain permafrost, although scientists have cautioned against identifying climate change as the sole immediate cause of this specific collapse before the event has been fully studied.
International assistance has begun reaching Nepal as the search continues. Neighboring countries and international organizations have offered emergency supplies, financial aid and technical support. The United Nations and humanitarian groups have mobilized assistance, while several governments are working with Nepalese and Chinese authorities to locate their citizens. Officials said identifying the missing remains especially difficult because many visitors were traveling in tour groups or moving through remote mountain areas when communications failed.
Search and recovery operations were continuing Friday local time, with authorities focused on reaching isolated settlements, locating missing residents and travelers and monitoring the barrier lakes for signs of another flood. The casualty figures are expected to change as crews search additional areas and authorities reconcile separate missing-person lists from Nepal, China and foreign governments.
Author note: Last updated August 27, 2026.