A wall of water and debris tore through Nepal's Rasuwa district on the morning of Wednesday, August 26, 2026, after what satellite imagery and early analysis from the US Geological Survey indicate was a large chunk of ice and rock breaking away from a Himalayan glacier. The resulting flood swept down the Bhote Koshi and Trishuli river systems, destroying homes, roads, and bridges in one of Nepal's most heavily trafficked trekking and pilgrimage corridors — and crossing into Tibet's Gyirong County on the Chinese side of the border.
As of Saturday, August 29, authorities have confirmed at least 626 deaths in Nepal and 7 in Tibet, with nearly 3,000 people still listed as missing across both countries. Officials on both sides have said the toll is expected to keep rising as search-and-rescue teams reach areas that remain cut off. Hundreds of the missing are foreign nationals — travelers, trekkers, and pilgrims from more than 30 countries, including the United States, Australia, Canada, the United Kingdom, and Malaysia.
These figures are moving targets. Nepal's government and international outlets have revised the death and missing counts upward every day since the flood struck, and readers should treat any single number as accurate only as of the date it was reported.
What triggered the flood
Officials have not yet issued a final determination on the exact cause, but the leading working theory — based on satellite imagery reviewed by scientists and reported by international outlets — is a glacial collapse that sent a torrent of ice, rock, and meltwater into the valley below, consistent with a glacial lake outburst flood (GLOF). A scientist at the Planetary Science Institute described newly visible glacial lakes forming near the collapse site as an unstable mass sitting upstream of the disaster zone — a detail that has prompted concern about further flooding rather than a one-time event.
India's Uttarakhand state, which also borders sensitive Himalayan glacier terrain, has since said it is increasing monitoring of its own glaciers as a precaution. More rain was forecast for the flood-affected areas of Nepal over the weekend, which officials say could complicate ongoing rescue operations.
Why it matters for travelers
The disaster struck during peak trekking and pilgrimage season in a corridor used by two very different but equally high-volume groups: trekkers heading into the Langtang Valley, Gosainkunda, and the Tamang Heritage Trail, and pilgrims traveling overland to Mount Kailash and Lake Mansarovar in Tibet via the Rasuwagadhi–Kerung border crossing.
Here is what is currently confirmed about access and safety in the region:
The Langtang Valley trekking region is closed to new departures. The Pasang Lhamu Highway — the main road connecting Kathmandu to the gateway town of Syabrubesi — has been damaged at multiple points, and authorities have suspended public transport toward Rasuwa, Nuwakot, and Dhading districts.
The Kerung (Rasuwagadhi) crossing used for the Kailash Mansarovar Yatra is not currently operating for pilgrim transit. Nepal-based operators say the border corridor and its access roads sustained extensive damage, and there is no confirmed timeline for reopening.
Nepal's Tourism Board has specifically advised postponing travel to the Galchhi–Nuwakot–Rasuwa–Syabrubesi corridor until road and safety conditions are reassessed.
Trekkers already in the upper Langtang Valley have reportedly been able to reach safety by rerouting to Thulo Syabru, according to trekking operators monitoring the region, though independent road travel toward Syabrubesi is not advised because of ongoing landslide risk.
Everest, Annapurna, Manaslu, and Mustang trekking regions are reported unaffected by the flood, based on rapid assessments carried out by Nepal-based trekking operators in the days following the disaster. These areas are outside the Rasuwa/Bhote Koshi corridor.
On the Chinese side, access has always been more tightly controlled: foreign travelers require special permits to enter Tibet, and local travelers need permits for border areas including Shigatse and the Everest scenic area. Information from Chinese authorities about the disaster's scale in Tibet has been more limited than reporting from the Nepali side.
If you have a trip planned — or a family member in the region
If you're currently booked on a Langtang trek or a Kailash Mansarovar pilgrimage, or you have a family member trekking in the area, several steps are consistently recommended by Nepal-based operators and tourism authorities:
Contact your booking agency or tour operator directly for the current status of your specific route and accommodations — conditions are changing by the day.
Do not attempt independent road travel toward Syabrubesi or the Rasuwa corridor; landslide risk remains along damaged sections of the highway.
If you believe a family member may be affected, contact your home country's foreign ministry or consular emergency line. The US State Department, Australia's Department of Foreign Affairs and Trade, and other governments have said they are actively working to account for their citizens in the region.
Nepal's Tourism Board has publicized a toll-free hotline for tourists affected by the disaster; travelers and family members should verify the current number through their embassy or tour operator, as emergency contact details can change during a large-scale response.
What happens next
Search-and-rescue operations remain active, with the Nepali Army using helicopters to reach cut-off areas and move survivors to Kathmandu. Officials in both Nepal and China have said the death and missing tolls are likely to change further as access to remote areas improves. The newly identified glacial lakes upstream of the disaster site are being monitored for the risk of additional flooding, meaning the situation in the affected corridor may remain unsafe for longer than initial damage estimates suggested.
For now, the clearest guidance for travelers is the simplest one: routes into Langtang and the Kailash Mansarovar overland crossing are not operating normally, other major Nepali trekking regions are reported unaffected, and anyone with plans in the affected corridor should confirm status directly with their operator before traveling.
FAQ
Is it safe to trek in Nepal right now? Most of Nepal's major trekking regions — including Everest, Annapurna, Manaslu, and Mustang — are reported unaffected by the flood and operating normally, based on assessments from Nepal-based trekking operators. The affected area is specifically the Rasuwa district and the Langtang/Bhote Koshi corridor.
Can I still do the Kailash Mansarovar Yatra? The overland route via the Rasuwagadhi–Kerung border crossing is not currently operating for pilgrim transit. Travelers with upcoming Yatra bookings should contact their operator for rerouting options or updated timelines rather than assuming the crossing will reopen quickly.
What caused the flood? The leading explanation, based on satellite imagery and early scientific analysis, is a glacial collapse — ice and rock breaking away from a Himalayan glacier and triggering a flash flood, consistent with a glacial lake outburst flood. Officials have not issued a final, confirmed cause.
How can I find out if a family member is safe? Contact your home country's foreign ministry or consular emergency line, and reach out to any tour operator or agency your family member booked through. Multiple governments, including the US and Australia, have said they are actively working to account for missing citizens.