A devastating flash flood in northern Nepal has killed at least 157 people and left nearly 400 others missing, including foreign tourists and security personnel, after an avalanche-triggered wall of water swept through communities along the Bhotekoshi River.
The disaster, which struck on Wednesday morning, has been described by officials and disaster experts as one of Nepal’s most severe natural catastrophes in recent decades. The sudden flood destroyed villages, roads, bridges, hydropower facilities and public infrastructure across several districts near the Nepal-China border.
Authorities said the disaster began when an avalanche in the Himalayan region blocked the Lhende River, a tributary of the Bhotekoshi River, before releasing a massive surge of water downstream. The flood first struck Timure near the Rasuwagadhi border crossing with China, where hundreds of residents and traders were caught completely off guard.
Unlike many monsoon-related floods, there was no heavy rainfall in the affected area before the disaster. Residents had no advance warning and were carrying out their normal activities when the flood suddenly arrived.
Rajendra Dhungana, chief customs officer in Rasuwa, described the moment as terrifying. He said he initially believed an earthquake had occurred after feeling the ground shake.
When he rushed outside, he saw a huge wave of water carrying debris moving rapidly towards Timure market.
According to Dhungana, the flood appeared like a nearly 100-metre-high wall of water and destroyed the market area within minutes. More than 300 vehicles and trucks waiting near the customs checkpoint were swept away.
As the flood continued downstream towards Syaphrubesi and other settlements, it destroyed everything in its path, including homes, livestock, bridges, roads and public facilities.
Hundreds missing, including foreign nationals
Nepal’s authorities said around 391 foreign citizens and 44 security personnel were among those reported missing.
The missing foreign tourists include visitors from several countries who were travelling through the popular Himalayan trekking region.
Officials warned that the final casualty numbers could increase as rescue teams continue searching remote areas where communication and transport links have been severely damaged.
Security officials believe the scale of missing people could make this one of the deadliest disasters in Nepal’s modern history.
Massive destruction across Rasuwa and neighbouring districts
The flood caused widespread destruction throughout Rasuwa, Nuwakot and surrounding areas.
Officials reported that nine hydropower projects and nine commercial bank branches were damaged. At least 19 motorable bridges and around 40 kilometres of highways were destroyed, creating major challenges for rescue and relief operations.
Hundreds of homes were washed away, while entire villages were buried under mud and debris.
Local representatives said many elderly residents and children remain missing.
Ravindra Nepal, a local government official from Bidur Municipality, said several settlements were completely destroyed and many families had lost their homes.
Residents described scenes of devastation, saying that even buildings still standing from a distance were covered with thick layers of mud and flood debris.
Early warning failure raises serious concerns
The disaster has raised questions about Nepal’s flood monitoring and cross-border emergency warning systems.
Officials said the flood originated from the Tibetan side of the Himalayan region, but Nepal received no advance information before the water entered its territory.
Although Nepal and China have agreements for cooperation on disaster management, experts say the lack of a real-time warning mechanism contributed to the scale of the tragedy.
Anil Pokhrel, former head of Nepal’s National Disaster Risk Reduction and Management Authority, said authorities must focus not only on rescue operations after disasters but also on preventing large-scale loss of life through better preparation and information sharing.
Experts warned that without direct communication between Nepal and Chinese authorities regarding Himalayan hazards, similar disasters could continue to threaten communities living downstream.
Avalanche identified as possible cause
The National Disaster Risk Reduction and Management Authority said preliminary analysis suggests that an avalanche approximately 20 kilometres northeast of the Rasuwagadhi border crossing in Tibet triggered the flood.
Satellite images reviewed by authorities showed evidence of an avalanche and subsequent debris-filled flooding along the Lhende River.
Climate and disaster specialists said glacier-related events are becoming an increasing concern in the Himalayan region due to rising temperatures and changing environmental conditions.
Flood monitoring systems overwhelmed
Nepal’s Flood Forecasting Division said it received information about the flood at 8:56am and issued warnings to downstream communities within minutes.
However, by the time alerts were sent, large areas of Rasuwa had already been affected.
Officials said automatic river monitoring stations installed along the upper Bhotekoshi River were destroyed by the force of the flood before they could send emergency warnings.
The stations normally provide automatic alerts when water levels rise, but the sudden intensity of the disaster overwhelmed the system.
Despite the failure in Rasuwa, officials said warnings sent to downstream districts such as Nuwakot may have helped many people escape.
Senior hydrologist Binod Parajuli said future disaster prevention requires stronger monitoring technology, including real-time sensors and cameras capable of detecting sudden Himalayan hazards.
Nepal and China agree to improve communication
Following the disaster, officials from Nepal’s Department of Hydrology and Meteorology and China’s Meteorological Administration held emergency discussions.
China agreed to provide Nepal with earlier warnings whenever dangerous water level increases or similar events occur on the Chinese side of the border.
Authorities said improving cross-border disaster communication will be essential to protecting communities living along Himalayan rivers.
Rescue operations continue
The Nepal Army, police and emergency agencies continue search and rescue operations across affected areas.
However, damaged roads, destroyed bridges and difficult mountain terrain are slowing efforts to reach isolated communities.
Officials say the priority remains finding missing people, providing medical assistance and delivering food and shelter to survivors.
The disaster has highlighted the growing vulnerability of Himalayan communities to sudden climate-related events and the urgent need for stronger early warning systems across borders.
