A massive flash flood swept through the Bhote Koshi-Trishuli river basin in Nepal's Rasuwa district on Wednesday [4, 5, 6].
The disaster occurred near the Nepal-Tibet border, destroying entire villages and critical infrastructure. Because the region is a hub for international trekking and trade, the surge has trapped hundreds of foreign nationals and local residents.
Preliminary analyses suggest the flood was triggered by an avalanche of ice and rock on the Tibetan side [4, 10]. This event caused water to surge into the basin around nine a.m. local time [11], while a separate mudslide near the Gyirong border crossing caused further deaths and disappearances [12]. Officials said heavy rainfall was not the primary cause of the event [4, 10].
Casualty reports vary significantly across agencies. NDTV reported 157 deaths [10], while other reports cited 22 [2, 7] or at least eight [8, 9]. Recovery teams have recovered 95 bodies [1].
Search and rescue operations are currently focused on the 403 people reported missing [1]. Of those unaccounted for, 341 are foreign nationals [1]. This includes 133 Indian citizens [1], though other reports estimate the number of missing Indians at 105 [14]. Additionally, 62 Nepalese citizens remain missing [1].
Bagmati Pradesh Police are coordinating the response in the Rasuwa district. Indian Prime Minister Narendra Modi spoke with Kathmandu Mayor Balen Shah to coordinate aid and rescue efforts [3]. The surge washed away multiple bridges, complicating the movement of emergency personnel into the affected river basin [2].
“An avalanche of ice and rock triggered the flash flood.”
The discrepancy in death tolls highlights the chaos of the initial rescue phase in a remote, high-altitude border region. The cause of the flood—a glacial or rock avalanche rather than rain—points to the increasing instability of Himalayan peaks, which poses a recurring threat to both local populations and the tourism industry in the Nepal-Tibet corridor.
