At least 289 people have died and 1,300 travelers (800 foreigners, and among them, four Spaniards) remain out of contact after a sudden flood in Nepal, near the border with Tibet, according to the latest balance communicated by the Nepali authorities. They warn that the number of victims may increase as emergency teams manage to access the most damaged areas.
The rise hit the district of Rasuwa, in the north of the country, on Wednesday, and swept away villages, markets, roads, vehicles, and hydroelectric facilities. The mass of water descended through the Bhote Koshi river system after particularly affecting Timure, Rasuwagadhi, and Syabrubesi, points located on one of the main land corridors between Nepal and Tibet.
A glacier and rock avalanche, main hypothesis
The initial investigations suggest that the rise may have begun after a glacier and rock avalanche that fell on the Lhende Khola river, a tributary of the Bhote Koshi, temporarily blocked the riverbed and subsequently caused a sudden release of water and sediments.
The International Centre for Integrated Mountain Development, based in Kathmandu, has identified that landslide as the immediate trigger of the flood. The flood then descended violently through the valley and reached infrastructures, homes, and populations located downstream.
The exact cause of the avalanche is still undetermined. Seismic records show a magnitude 4.4 earthquake approximately seven minutes before the moment when the images place the landslide. The Nepali government considers that possible connection, but specialists do not yet deem it proven.
Nearly 400 pilgrims remain out of contact
A significant portion of the missing were performing or preparing the route to Mount Kailash, located in Tibet and considered sacred by several Asian religions. A company specialized in these pilgrimages lost contact with about 390 travelers, most of whom are of Indian nationality.
Being "out of contact" does not necessarily mean that all those people have been swept away by the water. The floods have cut off roads, electricity, and communications in large areas of the border corridor, making it difficult to know their real situation.
Helicopters and military participate in rescues
The Nepal Army has deployed air and ground resources to try to reach the most affected areas. Six military helicopters and eight private aircraft have been mobilized, in addition to police, medical personnel, and specialized rescue teams.
The conditions considerably complicate the operation. Some helicopters have been unable to land in Syabru Besi and Timure because the river continues out of its normal course and large amounts of mud and sediment block access.
At least 29 people had been rescued according to the first reports. Authorities have also asked residents of the low-lying areas near the Bhote Koshi, Trishuli, and Narayani rivers to move to higher ground due to the risk of new floods.
Fear of a second flood
The emergency is still not considered over. Experts have detected a blockage that remains upstream near the border between Nepal and China, raising concerns about the possibility of water accumulating again and a second sudden discharge occurring.
Nepalese authorities have ordered to strengthen monitoring of the riverbed and to evacuate vulnerable areas as a precaution. The very configuration of the valley increases the danger: the Bhote Koshi descends from Tibet and eventually merges with the Trishuli, which then continues towards India.
Nepalese Prime Minister Balendra Shah has urged to take extreme precautions and has confirmed the mobilization of the Army and Police. India has offered humanitarian assistance and coordination for rescue efforts.
The disaster also reaches the Tibetan side
The flooding is not limited to Nepal. Chinese authorities have reported severe damage at the Gyirong border crossing, in the Tibetan region of Shigatse, where roads, communications, and electricity supply have been affected.
China has deployed more than 570 rescuers in the area. President Xi Jinping has ordered to intensify the search for missing persons and to strengthen monitoring and alert systems to prevent new disasters.
Rescue teams are having difficulties reaching some points due to the amount of mud. In certain accesses, sediments of up to 1.5 meters deep are accumulating, slowing down emergency operations.
The flood also hits Nepal's electricity production
The disaster has had significant consequences for energy infrastructure. Several hydroelectric plants and construction projects located next to rivers have been damaged or have had to stop their activity.
The Nepalese Ministry of Energy estimates that about 430 megawatts of hydroelectric capacity have been affected, equivalent to more than 12% of the country's installed hydroelectric capacity.
The damage to roads and bridges also adds problems for cross-border trade with China. The same region suffered in 2025 another flood that destroyed the so-called Friendship Bridge and kept the connections between Nepal and Tibet disrupted for months.
An area increasingly vulnerable to sudden floods
The Himalayas are particularly exposed to landslides, avalanches, sudden floods, and glacial lake outburst floods. Scientists warn that warming is accelerating ice loss in the region and increasing some of the risks associated with glacier and mountain instability.
The same Bhote Koshi corridor suffered a severe flood about a year ago. On that occasion, the overflow of a supraglacial lake located in Tibet caused a flood that left nine dead and 24 missing, in addition to destroying border infrastructure.
The priority remains to locate the hundreds of stranded travelers and access the devastated populations. The toll of 289 deceased remains provisional and the Nepalese authorities themselves warn that the final magnitude of the disaster cannot yet be assessed.