Flash flood devastates Nepal-Tibet border region: Hundreds dead or missing; 105 Indians among missing

Kathmandu: August 26: A sudden flash flood and mudslide struck the Nepal-Tibet border early on Wednesday, killing at least 17–18 people in Nepal, causing major casualties on the Chinese side, and leaving hundreds unaccounted for, including large numbers of tourists. Villages, roads, bridges, and hydropower facilities were washed away or heavily damaged in the mountainous Rasuwa district of Nepal and adjacent areas of Tibet.

The disaster hit Rasuwa (including Syapru Besi and Timure), just north of Kathmandu, with effects extending to Nuwakot and Dhading districts. Floodwaters surged along the Bhote Koshi River (also linked to the Lhende Khola), which originates in Tibet and flows into Nepal’s Trishuli River system. On the Tibetan side, a mudslide struck Gyirong Port (a key land crossing) in Gyirong county, Shigatse region, cutting roads, communications, and power. Chinese state media reported “major casualties” and people missing.

Loss of Life and Missing Persons
Confirmed deaths in Nepal stood at around 17–18 by afternoon local time according to police and other reports, though earlier figures ranged from eight to nine and the toll was expected to rise. Dozens were injured. Chinese authorities described significant casualties across the border without releasing precise numbers.

Nearly 400 people were reported missing or unaccounted for. The Nepal Tourism Board listed about 384 travellers, including roughly 291 foreign nationals (among them around 105 Indians, 12 British citizens, three U.S. citizens, Malaysians, South Koreans working at a hydropower site, and others) and 93 Nepalis, including guides. Security personnel were also among the missing: reports cited dozens of police, armed police, and military members. Search-and-rescue teams had recovered or rescued dozens of people (figures ranged from 12 to more than 80 in different updates), but high water levels prevented helicopters from landing in the worst-hit zones.

Damage to Property and Infrastructure
The flood swept away houses, villages, roads, and bridges. Multi-storey buildings collapsed or were partially submerged in muddy water and debris. Highways were closed, and hydropower and related facilities suffered major disruption—around 430 MW of electricity production capacity (more than 12% of Nepal’s total installed hydropower capacity of roughly 3.2 GW) was affected, according to the energy ministry and Nepal Electricity Authority. Transmission and distribution systems were also damaged. On the Tibetan side, the mudslide at Gyirong Port severed critical links. Authorities warned of possible secondary flooding due to an upstream blockage.

Cause

Preliminary information from Nepali officials, including Foreign Affairs Minister Shishir Khanal, indicated that an earthquake around 08:37 local time (magnitude approximately 4.4 according to some seismic data) triggered an ice-rock avalanche or landslide into the river system. This released a sudden surge of water, mud, rock, and melted snow/debris into the Bhote Koshi, producing the flash flood and mudslide. Heavy rainfall in Rasuwa itself was not seen as the primary driver, though satellite imagery showed significant rainfall on the Tibetan side; investigations also considered possible glacial contributions. The exact sequence remained under verification, with experts noting the risk of further releases.

This event recalled a similar Bhote Koshi flood in 2025 that killed at least nine people, left dozens missing, and destroyed the Friendship Bridge linking Nepal and China; that earlier disaster was linked to the drainage of a supraglacial lake in Tibet.

Response and Ongoing Situation

Nepal’s government, army, police, and rescue teams launched operations, with the prime minister ordering evacuations to safer ground. Coordination with China was underway. Chinese President Xi Jinping called for “all-out” search efforts and stronger monitoring and early-warning systems to prevent secondary disasters. Downstream alerts were issued in Nepal and for Indian states such as Bihar and Uttar Pradesh, as the river system eventually feeds into the Gandak.

Rescue and recovery efforts continued under difficult conditions, with the full scale of losses still being assessed. Officials anticipated “huge scale loss” overall.