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First modification: 09/03/2026 - 16:56 Last modification: 09/03/2026 - 16:56

A devastating flood hit the border between Nepal and China on August 26, after ice fell from a glacier, according to the main hypothesis of what happened. The tragedy, which left numerous victims and missing people according to preliminary reports, once again puts the focus on the vulnerability of populations living in high mountain areas such as the Himalayas. Why are these regions increasingly exposed to extreme events and what role does glacial melt play? We analyzed it on France 24.

On the morning of August 26, in a rugged mountainous area on the border between Nepal and the Tibet Autonomous Region (China), thousands of workers, foreign climbers and pilgrims heading to the sacred site of Mount Kailash were scattered across the region.

At 8:37 a.m. (local time), a massive section of ice and bedrock broke off the north face of the Langtang Lirung glacier on the Nepalese side. The impact, from more than 5,000 meters above sea level, triggered an avalanche of mud, rocks and ice that descended at enormous speed, destroying everything in its path along the valley of Langtang National Park.

Images recorded at the Rasuwagadhi/Gyirong border post show the magnitude of the phenomenon: in a matter of minutes, a gigantic mass of debris descended the bed of the Lhende Khola and Trishuli rivers, burying homes, roads, bridges and key infrastructure.

At first, the hypothesis of an earthquake was considered as a possible trigger. However, the United States Geological Survey (USGS) clarified that the seismic signal equivalent to a magnitude of 5.2 did not correspond to a previously transmitted tectonic earthquake, but to the energy itself released by the massive collapse of the mountain and the impact of the material.

Grief and thousands of missing people

Relief efforts continue while thousands of people remain missing, including hundreds of tourists and foreign travelers who were on the Langtang trekking route or the pilgrimage route. For thousands of local families, the harrowing search unfolds amidst the uncertainty and devastation of the total loss of their homes and livelihoods.

My brother-in-law had a liquor store here. This morning I received a call from him; She was crying and said that her entire house had been destroyed. Three members of the family were rescued, but his brother is still missing," said Raju Bhadel, a businessman in the area.

As rescue efforts continue, families have begun holding symbolic funerals and burials. Specialized teams from India and China, as well as hundreds of local volunteers, have joined the emergency operations led by the Nepalese Army. However, access to the most affected areas remains the main obstacle: the Pasang Lhamu highway and multiple communication routes were completely interrupted or buried under meters of mud.

A large-scale economic impact

The reconstruction phase could last for years. Early estimates from Nepal's Ministry of Finance place the cost of reconstruction efforts at between $4 billion and $5 billion—representing about 10% of the country's Gross Domestic Product (GDP)—a figure that could increase as damage to isolated communities and hydroelectric infrastructure is assessed.

The disaster has reopened the debate about the vulnerability and impact of climate change in the Himalayan region. Nepal Prime Minister Balendra Shah warned that this tragedy should be interpreted as a global wake-up call:

This is a serious sign that, along with climate change, the natural risks we face in the Himalayan region are increasing.

Shah also urged the international community and foreign visitors not to cancel their trips to other safe areas of the country, in an effort to avoid the collapse of the tourism industry, a fundamental pillar of the Nepalese economy.

Is it possible to prevent this type of catastrophes?

Given the magnitude of the event, the question arises to what extent a phenomenon of these characteristics can be foreseen. For Marta Guinau, a geologist at the University of Barcelona, ​​the geomorphology of the Himalayas itself explains the destructive capacity of these events:

"It is a characteristic of these mountainous areas with extremely steep slopes, which causes slope processes to be highly energetic and, therefore, highly destructive."

The specialist emphasizes the complex interaction between geological conditions and the development of infrastructure in the region. The Himalayas are home to numerous hydroelectric projects due to their great energy potential, but these facilities demand advanced continuous monitoring systems:

«These are areas where the installation of hydroelectric plants is encouraged, but these works must necessarily be accompanied by real-time monitoring. "The occurrence of a landslide in the headwaters can cause a flash flood with enormous impact."

Regarding the direct link with climate change, the geologist asks for analytical caution. Although rock and glacial collapses are natural geodynamic processes in young mountains, the sustained increase in temperatures alters the stability of permafrost and glacial dynamics, increasing the frequency of these collapses.

Future prevention will depend on integrating satellite remote sensing technology with community preparedness. According to Guinau, large-scale events are usually preceded by micro-landslides or deformations in the terrain that function as early warnings:

"Sometimes small landslides are generated that can be detected using appropriate instruments before a large-magnitude event is triggered."

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